diff --git a/src/plugins/projectexplorer/session.cpp b/src/plugins/projectexplorer/session.cpp
index c03baf88482..7518dc3cd02 100644
--- a/src/plugins/projectexplorer/session.cpp
+++ b/src/plugins/projectexplorer/session.cpp
@@ -637,7 +637,7 @@ QString SessionManagerPrivate::locationInProject(const QString &filePath) {
 
 QString SessionManagerPrivate::windowTitleAddition(const QString &filePath)
 {
-    return locationInProject(filePath);
+    return filePath.isEmpty() ? QString() : locationInProject(filePath);
 }
 
 QStringList SessionManagerPrivate::dependenciesOrder() const