diff --git a/DesignspaceEditor2.roboFontExt/lib/designspaceEditor/ui.py b/DesignspaceEditor2.roboFontExt/lib/designspaceEditor/ui.py
index b3d268d..1bb4718 100644
--- a/DesignspaceEditor2.roboFontExt/lib/designspaceEditor/ui.py
+++ b/DesignspaceEditor2.roboFontExt/lib/designspaceEditor/ui.py
@@ -1714,8 +1714,9 @@ def setDocumentNeedSave(self, state=True, **notificationsKwargs):
             self.w.getNSWindow().setDocumentEdited_(False)
 
     def setWindowTitleFromPath(self, path):
-        self.w.getNSWindow().setRepresentedURL_(AppKit.NSURL.fileURLWithPath_(path))
-        self.w.setTitle(os.path.basename(path))
+        if path is not None:
+            self.w.getNSWindow().setRepresentedURL_(AppKit.NSURL.fileURLWithPath_(path))
+            self.w.setTitle(os.path.basename(path))
 
     def updateColumnHeadersFromAxes(self):
         updateLists = [