diff --git a/src/plugins/qmakeprojectmanager/qmakenodes.cpp b/src/plugins/qmakeprojectmanager/qmakenodes.cpp
index 01a49101405..d17ccfd5a1b 100644
--- a/src/plugins/qmakeprojectmanager/qmakenodes.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakenodes.cpp
@@ -112,6 +112,7 @@ bool QmakeBuildSystem::supportsAction(Node *context, ProjectAction action, const
             }
             QTC_ASSERT(proFileNode, return false);
             pro = proFileNode->proFile();
+            QTC_ASSERT(pro, return false);
             t = pro->projectType();
         }