Merge remote-tracking branch 'leumasme/fix-minesweeper-crash' into dev

Author: Dream-Master

src/main/java/ru/timeconqueror/lootgames/minigame/minesweeper/GameMineSweeper.java

@@ -319,6 +319,10 @@ public void revealField(EntityPlayerMP player, Pos2i pos) {
 
                 save();
 
+                // If another revealField call within revealAllNeighbors already ran the win check,
+                // the board might already be reset
+                if (!board.isGenerated()) return;
+
                 if (board.checkWin()) {
                     onLevelSuccessfullyFinished();
                 }