Does the problem still occur when you leave Last Cave(assuming you can get out before it crashes)? Or is it just this map? If lately you've been crashing when you first enter the game, it can be a connection problem that's occurring. I'd suggest testing the problem by setting your characters home in another map, closing the FH tab, then logging in again on that character. If it crashes then, it's most likely your connection. If that is the case, I suggest making sure your wifi connection is strong, and that it's actually connected. If that fails, try restarting/unplugging then re-plugging your wifi router and trying again.
Hope this helped!