diff --git a/src/conf/config.js b/src/conf/config.js
index 52c3b32d..b1298467 100644
--- a/src/conf/config.js
+++ b/src/conf/config.js
@@ -7,7 +7,7 @@ export let CONFIG = {
 
     LOG_LEVEL: 'info',
 
-    ACK_TIMEOUT: 500,
+    ACK_TIMEOUT: 1000,
 
     LOG_TO_PAGE: false,
     
diff --git a/src/drivers/receive/index.js b/src/drivers/receive/index.js
index 84137669..080c0e27 100644
--- a/src/drivers/receive/index.js
+++ b/src/drivers/receive/index.js
@@ -77,7 +77,9 @@ function getTargetWindow(source, message) {
 export function receiveMessage(event) {
 
     try {
-        event.source // eslint-disable-line
+         if (!event.source) {
+            return;
+         }
     } catch (err) {
         return;
     }