diff --git a/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp b/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp
index e8432f0d5e..57cbd7501e 100644
--- a/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/MainThreadVM.cpp
@@ -286,6 +286,12 @@ JS::VM& main_thread_vm()
         vm->host_resolve_imported_module = [&](JS::ScriptOrModule, JS::ModuleRequest const&) -> JS::ThrowCompletionOr<NonnullRefPtr<JS::Module>> {
             return vm->throw_completion<JS::InternalError>(vm->current_realm()->global_object(), JS::ErrorType::NotImplemented, "Modules in the browser");
         };
+
+        // NOTE: We push a dummy execution context onto the JS execution context stack,
+        //       just to make sure that it's never empty.
+        auto& custom_data = *verify_cast<WebEngineCustomData>(vm->custom_data());
+        custom_data.root_execution_context = make<JS::ExecutionContext>(vm->heap());
+        vm->push_execution_context(*custom_data.root_execution_context);
     }
     return *vm;
 }
diff --git a/Userland/Libraries/LibWeb/Bindings/MainThreadVM.h b/Userland/Libraries/LibWeb/Bindings/MainThreadVM.h
index a085543d6e..686ce3ccb1 100644
--- a/Userland/Libraries/LibWeb/Bindings/MainThreadVM.h
+++ b/Userland/Libraries/LibWeb/Bindings/MainThreadVM.h
@@ -29,6 +29,8 @@ struct WebEngineCustomData final : public JS::VM::CustomData {
     // https://dom.spec.whatwg.org/#mutation-observer-list
     // FIXME: This should be a set.
     NonnullRefPtrVector<DOM::MutationObserver> mutation_observers;
+
+    OwnPtr<JS::ExecutionContext> root_execution_context;
 };
 
 struct WebEngineCustomJobCallbackData final : public JS::JobCallback::CustomData {