From 85d23c3751ad6bc89748b0b4512c7b1e962eb2a6 Mon Sep 17 00:00:00 2001
From: RickyRister <ricky.rister.wang@gmail.com>
Date: Fri, 18 Jul 2025 20:31:29 -0700
Subject: [PATCH] Fix server crash from out-of-bounds index when players is
 empty

---
 common/server_game.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/common/server_game.cpp b/common/server_game.cpp
index 9387ccd37..f27772bbb 100644
--- a/common/server_game.cpp
+++ b/common/server_game.cpp
@@ -677,6 +677,11 @@ void Server_Game::nextTurn()
 {
     QMutexLocker locker(&gameMutex);
 
+    if (players.isEmpty()) {
+        qWarning() << "Server_Game::nextTurn was called while players is empty; gameId = " << gameId;
+        return;
+    }
+
     const QList<int> keys = players.keys();
     int listPos = -1;
     if (activePlayer != -1)