diff --git a/src/plugins/cppeditor/cppmodelmanager.cpp b/src/plugins/cppeditor/cppmodelmanager.cpp
index cc08724373d..6f986bb7dd1 100644
--- a/src/plugins/cppeditor/cppmodelmanager.cpp
+++ b/src/plugins/cppeditor/cppmodelmanager.cpp
@@ -1940,6 +1940,8 @@ QSet<QString> CppModelManager::symbolsInFiles(const QSet<FilePath> &files) const
 
 void CppModelManager::onCoreAboutToClose()
 {
+    d->m_fallbackProjectPartTimer.disconnect();
+    d->m_fallbackProjectPartTimer.stop();
     ProgressManager::cancelTasks(Constants::TASK_INDEX);
     d->m_enableGC = false;
 }