diff --git a/MCGalaxy/Bots/BotsFile.cs b/MCGalaxy/Bots/BotsFile.cs
index d8e1e6203..a5f4438e7 100644
--- a/MCGalaxy/Bots/BotsFile.cs
+++ b/MCGalaxy/Bots/BotsFile.cs
@@ -29,7 +29,8 @@ namespace MCGalaxy.Bots {
             return "extra/bots/" + mapName + ".json";
         }
 
-        public static void Load(Level lvl) {
+        public static void Load(Level lvl) { lock (lvl.botsIOLock) { LoadCore(lvl); } }
+        static void LoadCore(Level lvl) {
             string path = BotsPath(lvl.MapName);
             if (!File.Exists(path)) return;
             string json = File.ReadAllText(path);
@@ -49,7 +50,8 @@ namespace MCGalaxy.Bots {
             }
         }
         
-        public static void Save(Level lvl) {
+        public static void Save(Level lvl) { lock (lvl.botsIOLock) { SaveCore(lvl); } }
+        static void SaveCore(Level lvl) {
             PlayerBot[] bots = lvl.Bots.Items;
             string path = BotsPath(lvl.MapName);
             if (!File.Exists(path) && bots.Length == 0) return;
@@ -67,7 +69,7 @@ namespace MCGalaxy.Bots {
             } catch (Exception ex) {
                 Logger.Log(LogType.Warning, "Failed to save bots file");
                 Logger.LogError(ex);
-            }
+            }            
         }
         
         static void LoadAi(BotProperties props, PlayerBot bot) {
diff --git a/MCGalaxy/Levels/Level.Fields.cs b/MCGalaxy/Levels/Level.Fields.cs
index d472b48b7..829e4aab8 100644
--- a/MCGalaxy/Levels/Level.Fields.cs
+++ b/MCGalaxy/Levels/Level.Fields.cs
@@ -74,7 +74,7 @@ namespace MCGalaxy {
         /// <remarks> true if both worldChat and Server.worldChat are true. </remarks>
         public bool SeesServerWideChat { get { return Config.ServerWideChat && ServerConfig.ServerWideChat; } }
         
-        internal readonly object queueLock = new object(), saveLock = new object(), savePropsLock = new object();
+        internal readonly object queueLock = new object(), saveLock = new object(), savePropsLock = new object(), botsIOLock = new object();
         public List<ulong> blockqueue = new List<ulong>();
         BufferedBlockSender bulkSender;