diff --git a/labelImg.py b/labelImg.py
index 8515509d..8e83a2fe 100755
--- a/labelImg.py
+++ b/labelImg.py
@@ -1190,7 +1190,10 @@ class MainWindow(QMainWindow, WindowMixin):
                 # If the labelling file does not exist yet, create if and
                 # re-save it with the verified attribute.
                 self.saveFile()
-                self.labelFile.toggleVerify()
+                if self.labelFile != None:
+                    self.labelFile.toggleVerify()
+                else:
+                    return
 
             self.canvas.verified = self.labelFile.verified
             self.paintCanvas()
diff --git a/libs/constants.py b/libs/constants.py
old mode 100644
new mode 100755
index fc749aa5..7e12d682
--- a/libs/constants.py
+++ b/libs/constants.py
@@ -12,5 +12,5 @@ SETTING_PAINT_LABEL = 'paintlabel'
 SETTING_LAST_OPEN_DIR = 'lastOpenDir'
 SETTING_AUTO_SAVE = 'autosave'
 SETTING_SINGLE_CLASS = 'singleclass'
-FORMAT_PASCALVOC='PscalVOC'
-FORMAT_YOLO='YOLO'
\ No newline at end of file
+FORMAT_PASCALVOC='PascalVOC'
+FORMAT_YOLO='YOLO'