Game crashes when looking at a specific place in my map

Attached SS is just after crash happened. It doesn't necessarily happen in that place but around there. It doesn't happen at anywhere else.

World was bigger than 100MB so i'll upload it to Google Drive and give a link in a sec.

Edit: https://drive.google.com/open?id=0BxmL7rfUg_yYQUp5RW9ZT3dKcmM