Check if osp.dirname is empty or not

labelme/app.py

@@ -926,7 +926,7 @@ class MainWindow(QtWidgets.QMainWindow, WindowMixin):
             imagePath = osp.relpath(
                 self.imagePath, osp.dirname(filename))
             imageData = self.imageData if self._config['store_data'] else None
-            if not osp.exists(osp.dirname(filename)):
+            if osp.dirname(filename) and not osp.exists(osp.dirname(filename)):
                 os.makedirs(osp.dirname(filename))
             lf.save(
                 filename=filename,