diff --git a/src/plugins/qmldesigner/designercore/model/abstractview.cpp b/src/plugins/qmldesigner/designercore/model/abstractview.cpp
index e728c61358f..046572d7140 100644
--- a/src/plugins/qmldesigner/designercore/model/abstractview.cpp
+++ b/src/plugins/qmldesigner/designercore/model/abstractview.cpp
@@ -873,7 +873,8 @@ void AbstractView::assignMaterialTo3dModel(const ModelNode &modelNode, const Mod
 
     ModelNode matLib = materialLibraryNode();
 
-    QTC_ASSERT(matLib.isValid(), return);
+    if (!matLib.isValid())
+        return;
 
     ModelNode newMaterialNode;