Acrobat keeps crashing

Hi 

My pdf keeps crashing as I tab out of the last field on the same page over and over. I've deleted the field, replaced it with another but it just keep crashing. I've swithed on & off security settings. All to no avail. Ive sent to the file to another machine & opened in Reader & it experiences the same issue in the same place. I have the crash log  (attached ) but no idea how to read/interpret it. Can anyone help?

TIA