--- a/js/src/builtin/ModuleObject.cpp
+++ b/js/src/builtin/ModuleObject.cpp
@@ -1650,16 +1650,20 @@ js::GetOrCreateModuleMetaObject(JSContex
     if (JSObject* obj = module->metaObject())
         return obj;
 
     RootedObject metaObject(cx, NewObjectWithGivenProto<PlainObject>(cx, nullptr));
     if (!metaObject)
         return nullptr;
 
     JS::ModuleMetadataHook func = cx->runtime()->moduleMetadataHook;
-    MOZ_ASSERT(func);
+    if (!func) {
+        JS_ReportErrorASCII(cx, "Module metadata hook not set");
+        return nullptr;
+    }
+
     if (!func(cx, module, metaObject))
         return nullptr;
 
     module->setMetaObject(metaObject);
 
     return metaObject;
 }

new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/modules/bug-1466487.js
@@ -0,0 +1,7 @@
+if (helperThreadCount() === 0)
+    quit();
+evalInWorker(`
+    let m = parseModule("import.meta;");
+    m.declarationInstantiation();
+    m.evaluation();
+`);