Don't change the active player if the game is already over. This fixes

the crash when the game is over and the dialog with the new, save and
cancel buttons is shown and the user clicks on the cancel button.

src/gamemanager.cpp

@@ -686,7 +686,10 @@ void Manager::sendPendingMove() {
 		default:
 			break;
 		}
-		changeActivePlayer();
+
+		//don't change the active player if the game is already over
+		if (d->gameStarted)
+			changeActivePlayer();
 	}
 }