diff --git a/content/base/src/nsWebSocket.cpp b/content/base/src/nsWebSocket.cpp
index bdf67ce21c8a..4fe7e1271c54 100644
--- a/content/base/src/nsWebSocket.cpp
+++ b/content/base/src/nsWebSocket.cpp
@@ -1300,7 +1300,9 @@ nsWebSocket::Close()
     // before calling it
     nsRefPtr<nsWebSocket> kungfuDeathGrip = this;
 
-    mConnection->FailConnection();
+    if (mConnection) {
+      mConnection->FailConnection();
+    }
     return NS_OK;
   }