diff --git a/src/plugins/cmakeprojectmanager/cmakesettingspage.cpp b/src/plugins/cmakeprojectmanager/cmakesettingspage.cpp
index 83f9daa216d..1e26c462c0c 100644
--- a/src/plugins/cmakeprojectmanager/cmakesettingspage.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakesettingspage.cpp
@@ -177,6 +177,8 @@ QModelIndex CMakeToolItemModel::addCMakeTool(const QString &name, const FileName
 
 void CMakeToolItemModel::addCMakeTool(const CMakeTool *item, bool changed)
 {
+    QTC_ASSERT(item, return);
+
     if (cmakeToolItem(item->id()))
         return;