Crash while deleting highlight.

[zuberkazi]

Steps to reproduce::

1. Select sentence and highlight it by any color, selection dragger should remain there.
2. Tap on selection dragger arrow (left or right), So that it will again select the sentence.
3. Release the selected sentence by tapping outside.
4. Delete that highlight by Quick action menu, Small highlight color should remain there.
5. Delete that remaining highlight by Quick action menu.

Current result:: App crash.

[zuberkazi]

It is reproducible by following below steps:

1. Highlight sentence.
2. Again select same sentence and delete it. Small highlight color remains there.
3. Delete small remaining highlight.

Current result:: App crash.