diff --git a/dom/base/nsFrameMessageManager.cpp b/dom/base/nsFrameMessageManager.cpp
index c5641a68eefe..4f5df0ef0e99 100644
--- a/dom/base/nsFrameMessageManager.cpp
+++ b/dom/base/nsFrameMessageManager.cpp
@@ -800,7 +800,10 @@ nsFrameMessageManager::DispatchAsyncMessageInternal(JSContext* aCx,
     return NS_OK;
   }
 
-  NS_ENSURE_TRUE(mCallback, NS_ERROR_NOT_INITIALIZED);
+  if (!mCallback) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
   if (!mCallback->DoSendAsyncMessage(aCx, aMessage, aData, aCpows, aPrincipal)) {
     return NS_ERROR_FAILURE;
   }