I had this error. After it, the game doesn't go to the next turn. Also, when closing and reloading from the last turn, I get the error again and everything repeats. The text on the next turn button says something about battles in progress when I press it, and then the button stays inactive forever.

They'll need a little more information to track down the bug. Check this thread for details:



/#/endless-legend/forum/23-mac-os/thread/6658-reporting-an-issue-mac-version