UITableView崩溃给出了calayerinvaliometry，原因:CALayer位包含NaN: [160 NaN]

I have a custom table view in my app. I have implemented the "Load More" feature to the table which loads 25 rows at a time. The problem is after loading 2 times the app crashes giving 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [160 nan]' as error on OS 4.2 and above. I have a custom table view in my app. I have im