Vortex Tracker crashes when loop text field is deleted

[vithotarek]

Hi Ivan,
I was playing with the VT and by an accident caused it to crash.

STEPS TO REPRODUCE

Version: Vortex Tracker 2.6 dev 22

1. In the Sample editor, remove the content of the Loop text field.
2. Click anywhere in the sample editor.

ACTUAL RESULT

VT crashes with the The "Application error occured. Backup file saved." dialog.

EXPECTED RESULT

No crash.

Thanks for looking into this! It's an awesome tracker!
X-agon