[DOM] Check whether module load request was already cancelled when a load fails

1 files changed, 5 insertions, 0 deletions

diff --git a/dom/script/ModuleLoadRequest.cpp b/dom/script/ModuleLoadRequest.cpp
index ec924ea7a4..2abc6236e8 100644
--- a/dom/script/ModuleLoadRequest.cpp
+++ b/dom/script/ModuleLoadRequest.cpp
@@ -148,6 +148,11 @@ ModuleLoadRequest::LoadFailed()
   // We failed to load the source text or an error occurred unrelated to the
   // content of the module (e.g. OOM).
 
+  if (IsCanceled()) {
+    return;
+  }
+
+  MOZ_ASSERT(!IsReadyToRun());
   MOZ_ASSERT(!mModuleScript);
 
   Cancel();