diff --git a/WebViewJavascriptBridge/WebViewJavascriptBridgeBase.m b/WebViewJavascriptBridge/WebViewJavascriptBridgeBase.m
index 3ec26ed4..6a3f8b3b 100755
--- a/WebViewJavascriptBridge/WebViewJavascriptBridgeBase.m
+++ b/WebViewJavascriptBridge/WebViewJavascriptBridgeBase.m
@@ -78,8 +78,10 @@ - (void)flushMessageQueue:(NSString *)messageQueueString{
         NSString* responseId = message[@"responseId"];
         if (responseId) {
             WVJBResponseCallback responseCallback = _responseCallbacks[responseId];
-            responseCallback(message[@"responseData"]);
-            [self.responseCallbacks removeObjectForKey:responseId];
+            if (responseCallback) {
+                responseCallback(message[@"responseData"]);
+                [self.responseCallbacks removeObjectForKey:responseId];
+            }
         } else {
             WVJBResponseCallback responseCallback = NULL;
             NSString* callbackId = message[@"callbackId"];