Toggle not working

[ali-fairbrass]

Happens occasionally. Shows error below:

AttributeError`                            Traceback (most recent call last)
C:\Users\Imogen\Documents\GitHub\AudioTagger\AudioTagger\audiotagger.py in toggl
eLabels(self)
   1161             activeLabel = 0
   1162         else:
-> 1163             activeLabel = self.findNextLabelInTime(self.activeLabel)
   1164             if activeLabel is None:
   1165                 activeLabel = 0

C:\Users\Imogen\Documents\GitHub\AudioTagger\AudioTagger\audiotagger.py in findN
extLabelInTime(self, currentActiveLabel)
   1144
   1145             diff = self.getLabelTimeValue(labelRect) - \
-> 1146                     self.getLabelTimeValue(self.labelRects[currentActive
Label])
   1147
   1148             if diff > 0:

C:\Users\Imogen\Documents\GitHub\AudioTagger\AudioTagger\audiotagger.py in getLa
belTimeValue(self, labelRect)
   1132
   1133     def getLabelTimeValue(self, labelRect):
-> 1134         return labelRect.rect().x()
   1135
   1136     def findNextLabelInTime(self, currentActiveLabel):

AttributeError: 'NoneType' object has no attribute 'rect'