diff --git a/js/src/jit-test/tests/basic/bug-1649234-1.js b/js/src/jit-test/tests/basic/bug-1649234-1.js
deleted file mode 100644
index 06e8a44fd6a5..000000000000
--- a/js/src/jit-test/tests/basic/bug-1649234-1.js
+++ /dev/null
@@ -1,8 +0,0 @@
-// |jit-test| exitstatus: 6;
-
-timeout(0.1, function() { return false; });
-Atomics.add(new Int32Array(1), 0, {
-  valueOf() {
-    while (1);
-  }
-});
diff --git a/js/src/jit-test/tests/basic/bug-1649234-2.js b/js/src/jit-test/tests/basic/bug-1649234-2.js
deleted file mode 100644
index 93603bab21a4..000000000000
--- a/js/src/jit-test/tests/basic/bug-1649234-2.js
+++ /dev/null
@@ -1,4 +0,0 @@
-// |jit-test| exitstatus: 6;
-
-setInterruptCallback(() => false);
-0n == {valueOf() { interruptIf(true); }};
diff --git a/js/src/jit-test/tests/basic/bug-1649234-3.js b/js/src/jit-test/tests/basic/bug-1649234-3.js
deleted file mode 100644
index 0af0296c487e..000000000000
--- a/js/src/jit-test/tests/basic/bug-1649234-3.js
+++ /dev/null
@@ -1,14 +0,0 @@
-// |jit-test| exitstatus: 3;
-
-let debuggerRealm = newGlobal({newCompartment: true});
-debuggerRealm.debuggee = this;
-debuggerRealm.eval(`
-  let dbg = new Debugger(debuggee);
-  dbg.onDebuggerStatement = (frame) => null;  // terminate the debuggee
-`);
-
-Atomics.add(new Int32Array(1), 0, {
-  valueOf() {
-    debugger;
-  }
-});
diff --git a/js/src/vm/JSContext.cpp b/js/src/vm/JSContext.cpp
index cec4d361e4fd..1d4ee7094ae8 100644
--- a/js/src/vm/JSContext.cpp
+++ b/js/src/vm/JSContext.cpp
@@ -865,6 +865,11 @@ mozilla::GenericErrorResult<OOM> JSContext::alreadyReportedOOM() {
 }
 
 mozilla::GenericErrorResult<JS::Error> JSContext::alreadyReportedError() {
+#ifdef DEBUG
+  if (!isHelperThreadContext()) {
+    MOZ_ASSERT(isExceptionPending());
+  }
+#endif
   return mozilla::Err(JS::Error());
 }