prevent dead lock

tgmsbot.py

@@ -341,6 +341,7 @@ def handle_button_click(bot, update):
         logger.debug("No game found for hash {}".format(bhash))
         return
     game.lock.acquire()
+    try:
         if game.stopped:
             return
         board = game.board
@@ -396,6 +397,12 @@ def handle_button_click(bot, update):
             update_keyboard_request(bot, bhash, game, chat_id, msg.message_id)
         else:
             game.lock.release()
+    except:
+        try:
+            game.lock.release()
+        except RuntimeError:
+            pass
+        raise