Forgot mutex lock on List<> for timers

OpenSim/Region/ScriptEngine/DotNetEngine/LSLLongCmdHandler.cs

@@ -124,6 +124,9 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
             if (Timers.Count == 0)
                 return;
 
+            lock (ListLock)
+            {
+
                 // Go through all timers
                 foreach (TimerClass ts in Timers)
                 {
@@ -138,6 +141,7 @@ namespace OpenSim.Region.ScriptEngine.DotNetEngine
                         ts.next = DateTime.Now.ToUniversalTime().AddSeconds(ts.interval);
                     }
                 }
+            } // lock
         }
 
     }