diff --git a/lib/exp_lists.js b/lib/exp_lists.js
index 725ad537..d9a37b8a 100644
--- a/lib/exp_lists.js
+++ b/lib/exp_lists.js
@@ -26,7 +26,6 @@ const _rtype = _valueExp(exp.ops.VAL_RTYPE, 'intVal')
  *********************************************************************************/
 
 function getListType (type, returnType, isMulti) {
-
   if (!Object.values(exp.type).includes(type)) {
     throw new TypeError('invalid value for valueType parameter')
   }
@@ -48,6 +47,9 @@ function getListType (type, returnType, isMulti) {
         expected = exp.type.LIST
       }
       break
+    case lists.returnType.EXISTS:
+      expected = exp.type.BOOL
+      break
     case lists.returnType.NONE:
     default:
       throw new TypeError('either set the return type as auto or match with return object data type')
diff --git a/lib/exp_maps.js b/lib/exp_maps.js
index 92a08f6b..34b7b66b 100644
--- a/lib/exp_maps.js
+++ b/lib/exp_maps.js
@@ -11,7 +11,6 @@ const _rtype = _valueExp(exp.ops.VAL_RTYPE, 'intVal')
  *********************************************************************************/
 
 function getMapType (type, returnType, isMulti) {
-
   if (!Object.values(exp.type).includes(type)) {
     throw new TypeError('invalid value for valueType parameter')
   }
@@ -34,6 +33,9 @@ function getMapType (type, returnType, isMulti) {
         expected = exp.type.LIST
       }
       break
+    case maps.returnType.EXISTS:
+      expected = exp.type.BOOL
+      break
     case maps.returnType.KEY_VALUE:
     case maps.returnType.ORDERED_MAP:
     case maps.returnType.UNORDERED_MAP: