1 files changed, 3 insertions, 2 deletions
diff --git a/src/qml/jsruntime/qv4script.cpp b/src/qml/jsruntime/qv4script.cpp
index 7f2e44eebf..e262eaa8ca 100644
--- a/src/qml/jsruntime/qv4script.cpp
+++ b/src/qml/jsruntime/qv4script.cpp
@@ -162,8 +162,9 @@ void QmlBindingWrapper::markObjects(Heap::Base *m, ExecutionEngine *e)
 
 static ReturnedValue signalParameterGetter(QV4::CallContext *ctx, uint parameterIndex)
 {
-    QV4::CallContext *signalEmittingContext = ctx->d()->parent->asCallContext();
-    Q_ASSERT(signalEmittingContext);
+    QV4::Scope scope(ctx);
+    QV4::Scoped<CallContext> signalEmittingContext(scope, static_cast<Heap::CallContext *>(ctx->d()->parent));
+    Q_ASSERT(signalEmittingContext && signalEmittingContext->d()->type >= QV4::Heap::ExecutionContext::Type_SimpleCallContext);
     return signalEmittingContext->argument(parameterIndex);
 }