diff --git a/dom/workers/XMLHttpRequest.cpp b/dom/workers/XMLHttpRequest.cpp
index e2b9b625e5d..4a5b65f8b58 100644
--- a/dom/workers/XMLHttpRequest.cpp
+++ b/dom/workers/XMLHttpRequest.cpp
@@ -2228,6 +2228,7 @@ XMLHttpRequest::Abort(ErrorResult& aRv)
 
   if (mCanceled) {
     aRv.ThrowUncatchableException();
+    return;
   }
 
   if (!mProxy) {