diff --git a/lib/resources/multiPartyCall.js b/lib/resources/multiPartyCall.js
index 858a51f..7d6ee1a 100644
--- a/lib/resources/multiPartyCall.js
+++ b/lib/resources/multiPartyCall.js
@@ -258,7 +258,7 @@ export class MultiPartyCall extends PlivoResource{
       params.hold = 'false'
     }
 
-    if(params.startMpcOnEnter){
+    if(params.startMpcOnEnter!=null){
       validParam('startMpcOnEnter', params.startMpcOnEnter, [Boolean, String], false)
     }
     else {