diff --git a/package.json b/package.json
index cc656489..9962e1b9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "express-openapi-validator",
-  "version": "3.14.1",
+  "version": "4.0.0",
   "description": "Automatically validate API requests and responses with OpenAPI 3 and Express.",
   "main": "dist/index.js",
   "scripts": {
diff --git a/src/middlewares/openapi.request.validator.ts b/src/middlewares/openapi.request.validator.ts
index dd10a1b4..097909ed 100644
--- a/src/middlewares/openapi.request.validator.ts
+++ b/src/middlewares/openapi.request.validator.ts
@@ -165,8 +165,8 @@ export class RequestValidator {
   }
 
   private processQueryParam(query, schema, whiteList: string[] = []) {
-    if (!schema.properties) return;
-    const knownQueryParams = new Set(Object.keys(schema.properties));
+    const keys = schema.properties ? Object.keys(schema.properties) : [];
+    const knownQueryParams = new Set(keys);
     whiteList.forEach((item) => knownQueryParams.add(item));
     const queryParams = Object.keys(query);
     const allowedEmpty = schema.allowEmptyValue;
diff --git a/test/query.params.spec.ts b/test/query.params.spec.ts
index 69ca63b2..374a3bc2 100644
--- a/test/query.params.spec.ts
+++ b/test/query.params.spec.ts
@@ -11,13 +11,14 @@ describe(packageJson.name, () => {
   before(async () => {
     // Set up the express app
     const apiSpec = path.join('test', 'resources', 'query.params.yaml');
-    app = await createApp({ apiSpec }, 3005, app =>
+    app = await createApp({ apiSpec }, 3005, (app) =>
       app.use(
         `${app.basePath}`,
         express
           .Router()
           .post(`/pets/nullable`, (req, res) => res.json(req.body))
           .get(`/no_reserved`, (req, res) => res.json(req.body))
+          .get(`/no_query_params`, (req, res) => res.json({ complete: true }))
           .get(`/allow_reserved`, (req, res) => res.json(req.body)),
       ),
     );
@@ -39,6 +40,17 @@ describe(packageJson.name, () => {
       })
       .expect(200));
 
+  it('should reject any query param when endpoint declares none', async () =>
+    request(app)
+      .get(`${app.basePath}/no_query_params`)
+      .query({
+        name: 'max',
+      })
+      .expect(400)
+      .then((r) => {
+        expect(r.body.errors).to.be.an('array');
+      }));
+
   it('should fail if unknown query param is specified', async () =>
     request(app)
       .get(`${app.basePath}/pets`)
@@ -51,7 +63,7 @@ describe(packageJson.name, () => {
         unknown_prop: 'test',
       })
       .expect(400)
-      .then(r => {
+      .then((r) => {
         expect(r.body.errors).to.be.an('array');
       }));
 
@@ -66,13 +78,11 @@ describe(packageJson.name, () => {
         owner_name: 'carmine',
       })
       .expect(400)
-      .then(r => {
+      .then((r) => {
         expect(r.body)
           .to.have.property('message')
           .that.equals("Empty value found for query parameter 'breed'");
-        expect(r.body.errors)
-          .to.be.an('array')
-          .with.length(1);
+        expect(r.body.errors).to.be.an('array').with.length(1);
         expect(r.body.errors[0].path).to.equal('.query.breed');
       }));
 
@@ -99,7 +109,7 @@ describe(packageJson.name, () => {
     request(app)
       .get(`${app.basePath}/no_reserved?value=ThisHas$ReservedChars!`)
       .expect(400)
-      .then(r => {
+      .then((r) => {
         const body = r.body;
         expect(body.message).equals(
           "Parameter 'value' must be url encoded. It's value may not contain reserved characters.",
diff --git a/test/resources/query.params.yaml b/test/resources/query.params.yaml
index 6869def6..5b0dcc5e 100644
--- a/test/resources/query.params.yaml
+++ b/test/resources/query.params.yaml
@@ -69,7 +69,12 @@ paths:
       responses:
         '200':
           description: success
-
+  /no_query_params: 
+    get:
+      description: test no query parameters
+      responses:
+        '200':
+          description: pet response
   /pets:
     get:
       description: |
diff --git a/test/resources/read.only.yaml b/test/resources/read.only.yaml
index 744380d3..b57b18fe 100644
--- a/test/resources/read.only.yaml
+++ b/test/resources/read.only.yaml
@@ -15,6 +15,11 @@ paths:
     post:
       description: get user
       operationId: getUser
+      parameters:
+        - name: include_id
+          in: query
+          schema:
+            type: boolean
       requestBody:
         required: true
         content:
@@ -44,6 +49,11 @@ paths:
     post:
       description: get user
       operationId: getUser
+      parameters:
+        - name: include_id
+          in: query
+          schema:
+            type: boolean
       requestBody:
         required: true
         content:
diff --git a/test/resources/request.bodies.ref.yaml b/test/resources/request.bodies.ref.yaml
index b937a1f4..8f4b3cd1 100644
--- a/test/resources/request.bodies.ref.yaml
+++ b/test/resources/request.bodies.ref.yaml
@@ -10,6 +10,11 @@ servers:
 paths:
   /request_bodies_ref:
     post:
+      parameters:
+        - name: bad_body
+          in: query
+          schema:
+            type: boolean
       requestBody:
         $ref: '#/components/requestBodies/TestBody'
       responses:
@@ -37,7 +42,6 @@ paths:
             '*/*':
               schema:
                 type: string
-
         '400':
           description: Bad Request
 
diff --git a/test/resources/write.only.yaml b/test/resources/write.only.yaml
index 68f0c4b6..64db4be3 100644
--- a/test/resources/write.only.yaml
+++ b/test/resources/write.only.yaml
@@ -15,6 +15,11 @@ paths:
     post:
       description: create products
       operationId: createProductsInline
+      parameters: 
+        - name: exclude_write_only
+          in: query
+          schema:
+            type: boolean
       requestBody:
         required: true
         content:
@@ -45,6 +50,11 @@ paths:
     post:
       description: create products
       operationId: createProductsNested
+      parameters: 
+        - name: exclude_write_only
+          in: query
+          schema:
+            type: boolean
       requestBody:
         required: true
         content: