From 0df59363c4c6526d253ee018b6c26c46f42eb440 Mon Sep 17 00:00:00 2001
From: Thomas Hartmann <thomas.hartmann@qt.io>
Date: Tue, 28 Mar 2023 17:07:28 +0200
Subject: QmlDesigner: Fix crash

The buildsystem might be missing.

Change-Id: I05e03f59a2fcb49ce1ff7a2521ed1af165730b51
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
(cherry picked from commit bcd74a2fad243fc7683fd98633b91da4e394c0e8)
---
 src/plugins/qmldesigner/components/toolbar/toolbarbackend.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/plugins/qmldesigner/components/toolbar/toolbarbackend.cpp b/src/plugins/qmldesigner/components/toolbar/toolbarbackend.cpp
index 883ae50acc..718375f7c6 100644
--- a/src/plugins/qmldesigner/components/toolbar/toolbarbackend.cpp
+++ b/src/plugins/qmldesigner/components/toolbar/toolbarbackend.cpp
@@ -64,6 +64,10 @@ static Utils::FilePath getMainUiFile()
 
     auto qmlBuildSystem = qobject_cast<QmlProjectManager::QmlBuildSystem *>(
         project->activeTarget()->buildSystem());
+
+    if (!qmlBuildSystem)
+        return {};
+
     return qmlBuildSystem->mainUiFilePath();
 }
 
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