Index: src/server/adminmanager.cpp
===================================================================
--- src/server/adminmanager.cpp	(revision 5687)
+++ src/server/adminmanager.cpp	(working copy)
@@ -3968,7 +3968,9 @@
         gemActor *actor = (gemActor*) target;
         
         // allow this violation
-        actor->GetClient()->SetCheatMask(MOVE_CHEAT, true);
+        if (actor->GetClient())
+            actor->GetClient()->SetCheatMask(MOVE_CHEAT, true);
+
         actor->Teleport(sector, pos, yrot, instance);
     }
     else