Crashing when building Blight towers

I crash regularly when building blight towers, this also happens to a friend of mine, it only happens when i or he build a tower and as soon as i stop building towers the game won't crash again, i have tried doing a packCheck and switching renderers and nothing helps...

Any suggestion? i really like blight but its annoying crashing every time i do blights (its not 100% chance of crashing but eventually i crash after doing a couple of blights)