diff --git a/dom/base/crashtests/1780790.html b/dom/base/crashtests/1780790.html
deleted file mode 100644
index 0bc4364763a2..000000000000
--- a/dom/base/crashtests/1780790.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<html  class="reftest-wait">
-  <head>
-    <script>
-      function test() {
-        let ac = new AbortController();
-        scheduler.postTask(()=> { ac.abort(); throw "Foobar";  }, { signal: ac.signal });
-        scheduler.postTask(()=> document.documentElement.removeAttribute('class'));
-      }
-    </script>
-    <style>
-    </style>
-  </head>
-  <body onload="test()">
-  </body>
-</html>
diff --git a/dom/base/crashtests/crashtests.list b/dom/base/crashtests/crashtests.list
index 4e83d4a013f3..c8eff9409817 100644
--- a/dom/base/crashtests/crashtests.list
+++ b/dom/base/crashtests/crashtests.list
@@ -267,4 +267,3 @@ skip-if(ThreadSanitizer||Android) load 1712198.html # Mysterious failure that sh
 skip-if(Android) HTTP load 1728670-1.html
 load 1757923.html
 load 1766472.html
-load 1780790.html
diff --git a/dom/webscheduling/WebTaskScheduler.cpp b/dom/webscheduling/WebTaskScheduler.cpp
index fa920b478724..610ddb8dc1d5 100644
--- a/dom/webscheduling/WebTaskScheduler.cpp
+++ b/dom/webscheduling/WebTaskScheduler.cpp
@@ -109,10 +109,12 @@ bool WebTask::Run() {
   MOZ_ASSERT_IF(promiseState != Promise::PromiseState::Pending,
                 promiseState == Promise::PromiseState::Rejected);
 
-  if (error.Failed()) {
-    mPromise->MaybeReject(std::move(error));
-  } else {
-    mPromise->MaybeResolve(returnVal);
+  if (promiseState == Promise::PromiseState::Pending) {
+    if (error.Failed()) {
+      mPromise->MaybeReject(std::move(error));
+    } else {
+      mPromise->MaybeResolve(returnVal);
+    }
   }
 
   MOZ_ASSERT(!isInList());
