diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a4b2e8..54bc519 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,17 @@
 
 ---
 
+## ## [0.6.1] - 2020-07-02
+
+#### - :bug: [Bug Fix]
+
+- Allowed null dates (#56)
+- Added export multiple sub collections (#57)
+
+#### - :nail_care: [Polish]
+
+- Added contributing file
+
 ## [0.6.0] - 2020-05-26
 
 #### - :nail_care: [Polish]
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..c539fac
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,3 @@
+# Contributing to Firestore Backup & Restore
+
+I would love for you to contribute to this project and help make it better than it is today. I will update the the detail later. For now, just a simple pull request will works.
diff --git a/README.md b/README.md
index 88c5291..44ddd4f 100644
--- a/README.md
+++ b/README.md
@@ -93,7 +93,7 @@ const options = {
   dates: ['date1', 'date1.date2', 'date1.date2.date3'],
   geos: ['location', 'locations'],
   refs: ['refKey'],
-  nested: true // look up the data keys also in nested maps
+  nested: true, // look up the data keys also in nested maps
 };
 ```
 
@@ -164,6 +164,12 @@ The JSON is formated as below. The collection name is **test**. **first-key** an
         "_latitude": 49.290683,
         "_longitude": -123.133956
       },
+      "locationNested": {
+        "geopoint": {
+          "_latitude": 49.290683,
+          "_longitude": -123.133956
+        }
+      },
       "locations": [
         {
           "_latitude": 50.290683,
@@ -177,6 +183,9 @@ The JSON is formated as below. The collection name is **test**. **first-key** an
       "email": "dungnq@itbox4vn.com",
       "secondRef": "test/second-key",
       "arrayRef": ["test/second-key", "test/second-key"],
+      "nestedRef": {
+        "secondRef": "test/second-key"
+      },
       "subCollection": {
         "test/first-key/details": {
           "33J2A10u5902CXagoBP6": {
@@ -187,6 +196,16 @@ The JSON is formated as below. The collection name is **test**. **first-key** an
             "dogName": "lala",
             "dogId": "2"
           }
+        },
+        "test/first-key/contacts": {
+          "33J2A10u5902CXagoBP6": {
+            "contactId": "1",
+            "name": "Dale Nguyen"
+          },
+          "MSZTWEP7Lewx0Qr1Mu5s": {
+            "contactId": "2",
+            "name": "Yen Nguyen"
+          }
         }
       }
     },
diff --git a/dist/export.js b/dist/export.js
index b29ea1f..2875943 100644
--- a/dist/export.js
+++ b/dist/export.js
@@ -12,4 +12,5 @@ op=body.call(thisArg,_);}catch(e){op=[6,e];y=0;}finally{f=t=0;}
 if(op[0]&5)throw op[1];return{value:op[0]?op[1]:void 0,done:true};}};var __spreadArrays=(this&&this.__spreadArrays)||function(){for(var s=0,i=0,il=arguments.length;i<il;i++)s+=arguments[i].length;for(var r=Array(s),k=0,i=0;i<il;i++)
 for(var a=arguments[i],j=0,jl=a.length;j<jl;j++,k++)
 r[k]=a[j];return r;};var __importStar=(this&&this.__importStar)||function(mod){if(mod&&mod.__esModule)return mod;var result={};if(mod!=null)for(var k in mod)if(Object.hasOwnProperty.call(mod,k))result[k]=mod[k];result["default"]=mod;return result;};Object.defineProperty(exports,"__esModule",{value:true});var admin=__importStar(require("firebase-admin"));exports.getAllCollections=function(collectionNameArray){var db=admin.firestore();return new Promise(function(resolve){db.listCollections().then(function(snap){var paths=collectionNameArray;if(paths.length===0){snap.forEach(function(collection){return paths.push(collection.path);});}
-var promises=[];paths.forEach(function(segment){var result=exports.backup(segment);promises.push(result);});Promise.all(promises).then(function(value){var all=Object.assign.apply(Object,__spreadArrays([{}],value));resolve(all);});});});};exports.backup=function(collectionName){return __awaiter(void 0,void 0,void 0,function(){var db,data,documents,_i,_a,doc,subCollections,_b,subCollections_1,subCol,subColData,error_1;return __generator(this,function(_c){switch(_c.label){case 0:_c.trys.push([0,9,,10]);db=admin.firestore();data={};data[collectionName]={};return[4,db.collection(collectionName).get()];case 1:documents=_c.sent();_i=0,_a=documents.docs;_c.label=2;case 2:if(!(_i<_a.length))return[3,8];doc=_a[_i];return[4,doc.ref.listCollections()];case 3:subCollections=_c.sent();data[collectionName][doc.id]=doc.data();_b=0,subCollections_1=subCollections;_c.label=4;case 4:if(!(_b<subCollections_1.length))return[3,7];subCol=subCollections_1[_b];return[4,exports.backup(collectionName+"/"+doc.id+"/"+subCol.id)];case 5:subColData=_c.sent();data[collectionName][doc.id]['subCollection']=subColData;_c.label=6;case 6:_b++;return[3,4];case 7:_i++;return[3,2];case 8:return[2,data];case 9:error_1=_c.sent();console.error(error_1);throw new Error(error_1);case 10:return[2];}});});};
\ No newline at end of file
+var promises=[];paths.forEach(function(segment){var result=exports.backup(segment);promises.push(result);});Promise.all(promises).then(function(value){var all=Object.assign.apply(Object,__spreadArrays([{}],value));resolve(all);});});});};exports.backup=function(collectionName){return __awaiter(void 0,void 0,void 0,function(){function addElement(ElementList,element){var newList=Object.assign(ElementList,element);return newList;}
+var db,data,documents,_i,_a,doc,subCollections,_b,subCollections_1,subCol,subColData,error_1;return __generator(this,function(_c){switch(_c.label){case 0:_c.trys.push([0,9,,10]);db=admin.firestore();data={};data[collectionName]={};return[4,db.collection(collectionName).get()];case 1:documents=_c.sent();_i=0,_a=documents.docs;_c.label=2;case 2:if(!(_i<_a.length))return[3,8];doc=_a[_i];return[4,doc.ref.listCollections()];case 3:subCollections=_c.sent();data[collectionName][doc.id]=doc.data();data[collectionName][doc.id]['subCollection']={};_b=0,subCollections_1=subCollections;_c.label=4;case 4:if(!(_b<subCollections_1.length))return[3,7];subCol=subCollections_1[_b];return[4,exports.backup(collectionName+"/"+doc.id+"/"+subCol.id)];case 5:subColData=_c.sent();data[collectionName][doc.id]['subCollection']=addElement(data[collectionName][doc.id]['subCollection'],subColData);_c.label=6;case 6:_b++;return[3,4];case 7:_i++;return[3,2];case 8:return[2,data];case 9:error_1=_c.sent();console.error(error_1);throw new Error(error_1);case 10:return[2];}});});};
\ No newline at end of file
diff --git a/dist/export.js.map b/dist/export.js.map
index 4d83b2d..4db2c84 100644
--- a/dist/export.js.map
+++ b/dist/export.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/dist/helper.js b/dist/helper.js
index fad82b4..1654329 100644
--- a/dist/helper.js
+++ b/dist/helper.js
@@ -5,7 +5,7 @@ Object.defineProperty(exports, "__esModule", { value: true });
  * @param firebaseTimestamp
  */
 exports.makeTime = function (firebaseTimestamp) {
-    if (!firebaseTimestamp._seconds) {
+    if (!firebaseTimestamp || !firebaseTimestamp._seconds) {
         return null;
     }
     return new Date(firebaseTimestamp._seconds * 1000);
diff --git a/dist/helper.js.map b/dist/helper.js.map
index 2d9dc1e..8ac72a4 100644
--- a/dist/helper.js.map
+++ b/dist/helper.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..f307f54
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2781 @@
+{
+  "name": "firestore-export-import",
+  "version": "0.6.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@firebase/app-types": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.6.1.tgz",
+      "integrity": "sha512-L/ZnJRAq7F++utfuoTKX4CLBG5YR7tFO3PLzG1/oXXKEezJ0kRL3CMRoueBEmTCzVb/6SIs2Qlaw++uDgi5Xyg=="
+    },
+    "@firebase/auth-interop-types": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/@firebase/auth-interop-types/-/auth-interop-types-0.1.5.tgz",
+      "integrity": "sha512-88h74TMQ6wXChPA6h9Q3E1Jg6TkTHep2+k63OWg3s0ozyGVMeY+TTOti7PFPzq5RhszQPQOoCi59es4MaRvgCw=="
+    },
+    "@firebase/component": {
+      "version": "0.1.15",
+      "resolved": "https://registry.npmjs.org/@firebase/component/-/component-0.1.15.tgz",
+      "integrity": "sha512-HqFb1qQl1vtlUMIzPM15plNz27jqM8DWjuQQuGeDfG+4iRRflwKfgNw1BOyoP4kQ8vOBCL7t/71yPXSomNdJdQ==",
+      "requires": {
+        "@firebase/util": "0.2.50",
+        "tslib": "^1.11.1"
+      }
+    },
+    "@firebase/database": {
+      "version": "0.6.6",
+      "resolved": "https://registry.npmjs.org/@firebase/database/-/database-0.6.6.tgz",
+      "integrity": "sha512-TqUJOaCATF/h3wpqhPT9Fz1nZI6gBv/M2pHZztUjX4A9o9Bq93NyqUurYiZnGB7zpSkEADFCVT4f0VBrWdHlNw==",
+      "requires": {
+        "@firebase/auth-interop-types": "0.1.5",
+        "@firebase/component": "0.1.15",
+        "@firebase/database-types": "0.5.1",
+        "@firebase/logger": "0.2.5",
+        "@firebase/util": "0.2.50",
+        "faye-websocket": "0.11.3",
+        "tslib": "^1.11.1"
+      }
+    },
+    "@firebase/database-types": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/@firebase/database-types/-/database-types-0.5.1.tgz",
+      "integrity": "sha512-onQxom1ZBYBJ648w/VNRzUewovEDAH7lvnrrpCd69ukkyrMk6rGEO/PQ9BcNEbhlNtukpsqRS0oNOFlHs0FaSA==",
+      "requires": {
+        "@firebase/app-types": "0.6.1"
+      }
+    },
+    "@firebase/logger": {
+      "version": "0.2.5",
+      "resolved": "https://registry.npmjs.org/@firebase/logger/-/logger-0.2.5.tgz",
+      "integrity": "sha512-qqw3m0tWs/qrg7axTZG/QZq24DIMdSY6dGoWuBn08ddq7+GLF5HiqkRj71XznYeUUbfRq5W9C/PSFnN4JxX+WA=="
+    },
+    "@firebase/util": {
+      "version": "0.2.50",
+      "resolved": "https://registry.npmjs.org/@firebase/util/-/util-0.2.50.tgz",
+      "integrity": "sha512-vFE6+Jfc25u0ViSpFxxq0q5s+XmuJ/y7CL3ud79RQe+WLFFg+j0eH1t23k0yNSG9vZNM7h3uHRIXbV97sYLAyw==",
+      "requires": {
+        "tslib": "^1.11.1"
+      }
+    },
+    "@google-cloud/common": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@google-cloud/common/-/common-2.4.0.tgz",
+      "integrity": "sha512-zWFjBS35eI9leAHhjfeOYlK5Plcuj/77EzstnrJIZbKgF/nkqjcQuGiMCpzCwOfPyUbz8ZaEOYgbHa759AKbjg==",
+      "optional": true,
+      "requires": {
+        "@google-cloud/projectify": "^1.0.0",
+        "@google-cloud/promisify": "^1.0.0",
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+      "dev": true,
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+      }
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+          }
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
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+      "optional": true,
+      "requires": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
+      }
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+    },
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+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
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+    },
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+      "dev": true,
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+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
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+        "which-module": "^2.0.0",
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+        },
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+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
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+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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+          "dev": true,
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+            "ansi-regex": "^4.1.0"
+          }
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+    "yargs-parser": {
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
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+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
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+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      }
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index 293f866..b233635 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "firestore-export-import",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "description": "NPM package for backup and restore Firebase Firestore",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/export.ts b/src/export.ts
index 2a4d439..1a55153 100644
--- a/src/export.ts
+++ b/src/export.ts
@@ -39,6 +39,12 @@ export const getAllCollections = (collectionNameArray): Promise<any> => {
  * @returns {Promise<any>}
  */
 export const backup = async (collectionName: string): Promise<any> => {
+
+  function addElement(ElementList: Object, element: Object) {
+    let newList = Object.assign(ElementList, element)
+    return newList
+  }
+
   try {
     const db = admin.firestore();
     let data = {};
@@ -50,12 +56,13 @@ export const backup = async (collectionName: string): Promise<any> => {
       const subCollections = await doc.ref.listCollections();
 
       data[collectionName][doc.id] = doc.data();
+      data[collectionName][doc.id]['subCollection'] = {};
 
       for (const subCol of subCollections) {
         const subColData = await backup(
           `${collectionName}/${doc.id}/${subCol.id}`
         );
-        data[collectionName][doc.id]['subCollection'] = subColData;
+        data[collectionName][doc.id]['subCollection'] = addElement(data[collectionName][doc.id]['subCollection'], subColData);
       }
     }
 
diff --git a/src/helper.ts b/src/helper.ts
index 5ec7bdf..5305490 100644
--- a/src/helper.ts
+++ b/src/helper.ts
@@ -13,7 +13,7 @@ export const makeTime = (firebaseTimestamp: {
   _seconds: number
   _nanoseconds: number
 }): Date => {
-  if (!firebaseTimestamp._seconds) {
+  if (!firebaseTimestamp || !firebaseTimestamp._seconds) {
     return null
   }
   return new Date(firebaseTimestamp._seconds * 1000)
diff --git a/test/firestore.spec.ts b/test/firestore.spec.ts
index 59ef901..7723405 100644
--- a/test/firestore.spec.ts
+++ b/test/firestore.spec.ts
@@ -1,42 +1,42 @@
-import { expect } from 'chai'
-import request from 'request-promise'
-import * as firestoreService from '../dist'
-import { serviceAccount } from './serviceAccount'
+import { expect } from 'chai';
+import request from 'request-promise';
+import * as firestoreService from '../dist';
+import { serviceAccount } from './serviceAccount';
 
 const app = firestoreService.initializeApp(
   serviceAccount,
   serviceAccount.databaseUrl
-)
+);
 const backupAPI =
-  'https://firebasestorage.googleapis.com/v0/b/firbase-function-helper-qa.appspot.com/o/import-to-firestore.json?alt=media&token=a0530902-8983-45a4-90c2-72c345c7a3d5'
+  'https://firebasestorage.googleapis.com/v0/b/firbase-function-helper-qa.appspot.com/o/import-to-firestore.json?alt=media&token=a0530902-8983-45a4-90c2-72c345c7a3d5';
 
 describe('initializeApp function test', () => {
   it('Initialize app', () => {
-    expect(app).to.equal(true)
-  })
+    expect(app).to.equal(true);
+  });
 
   it('Restore data from API', async () => {
-    const backupData = await request(backupAPI)
+    const backupData = await request(backupAPI);
     const status = await firestoreService.restore(JSON.parse(backupData), {
       dates: ['date'],
       geos: ['location'],
-    })
-    expect(status.status).ok
-  })
+    });
+    expect(status.status).ok;
+  });
 
   it('Get all collections', async () => {
     try {
-      const all = await firestoreService.backups()
-      expect(Object.keys(all).length).is.greaterThan(0)
+      const all = await firestoreService.backups();
+      expect(Object.keys(all).length).is.greaterThan(0);
     } catch (error) {
-      console.log(error)
+      console.log(error);
     }
-  })
+  });
 
   it('Get an array of collections', async () => {
-    const all = await firestoreService.backups(['test', 'users'])
-    expect(Object.keys(all).length).is.equal(2)
-  })
+    const all = await firestoreService.backups(['test', 'users']);
+    expect(Object.keys(all).length).is.equal(2);
+  });
 
   it('Restore data with document id', async () => {
     let status = await firestoreService.restore(
@@ -46,47 +46,47 @@ describe('initializeApp function test', () => {
         geos: ['location', 'locations', 'locationNested.geopoints'],
         refs: ['secondRef', 'arrayRef', 'nestedRef.secondRef'],
       }
-    )
-    expect(status.status).ok
+    );
+    expect(status.status).ok;
 
-    const result = await firestoreService.backup('test')
+    const result = await firestoreService.backup('test');
 
-    expect(result.test['first-key'].email).is.equal('dungnq@itbox4vn.com')
-    expect(result.test['first-key'].schedule.time._seconds).equals(1534046400)
+    expect(result.test['first-key'].email).is.equal('dungnq@itbox4vn.com');
+    expect(result.test['first-key'].schedule.time._seconds).equals(1534046400);
     expect(result.test['first-key'].three.level.time._seconds).equals(
       1534046400
-    )
-    expect(typeof result.test['first-key'].secondRef).is.equal('object')
+    );
+    expect(typeof result.test['first-key'].secondRef).is.equal('object');
     // locations
-    expect(result.test['first-key'].location._latitude).equal(49.290683)
-    expect(result.test['first-key'].locations[0]._latitude).equal(50.290683)
-    expect(result.test['first-key'].locations[1]._latitude).equal(51.290683)
+    expect(result.test['first-key'].location._latitude).equal(49.290683);
+    expect(result.test['first-key'].locations[0]._latitude).equal(50.290683);
+    expect(result.test['first-key'].locations[1]._latitude).equal(51.290683);
     expect(result.test['first-key'].locationNested.geopoint._latitude).equal(
       49.290683
-    )
+    );
     expect(
       result.test['first-key'].subCollection['test/first-key/details'][
         '33J2A10u5902CXagoBP6'
       ].dogName
-    ).is.equal('hello')
-  })
+    ).is.equal('hello');
+  });
 
   it('Restore data as an array without document id', async () => {
     let status = await firestoreService.restore(
       'test/import-array-to-firestore.json'
-    )
-    expect(status.status).ok
-  })
+    );
+    expect(status.status).ok;
+  });
 
   it('Get a colection with sub-collection', async () => {
     try {
-      const data = await firestoreService.backup('test')
-      const subCol = data['test']['first-key']['subCollection']
+      const data = await firestoreService.backup('test');
+      const subCol = data['test']['first-key']['subCollection'];
 
-      expect(subCol).is.exist
-      expect(Object.values(subCol).length).is.greaterThan(0)
+      expect(subCol).is.exist;
+      expect(Object.values(subCol).length).equals(2); // 2 sub collections
     } catch (error) {
-      console.log(error)
+      console.log(error);
     }
-  })
-})
+  });
+});
diff --git a/test/import-to-firestore.json b/test/import-to-firestore.json
index b9c765c..a7a0f9e 100644
--- a/test/import-to-firestore.json
+++ b/test/import-to-firestore.json
@@ -60,6 +60,16 @@
             "dogName": "lala",
             "dogId": "2"
           }
+        },
+        "test/first-key/contacts": {
+          "33J2A10u5902CXagoBP6": {
+            "contactId": "1",
+            "name": "Dale Nguyen"
+          },
+          "MSZTWEP7Lewx0Qr1Mu5s": {
+            "contactId": "2",
+            "name": "Yen Nguyen"
+          }
         }
       }
     },