Core/Gridnotifiers: Fix a possible crash in MessageDistDeliverer::SendPacket

Updates issue #5016
Please try to re-reproduce

--HG--
branch : trunk

1 files changed, 2 insertions, 1 deletions

diff --git a/src/server/game/Grids/Notifiers/GridNotifiers.h b/src/server/game/Grids/Notifiers/GridNotifiers.h
index 6bb392a51b8..e4ca3b5018f 100755
--- a/src/server/game/Grids/Notifiers/GridNotifiers.h
+++ b/src/server/game/Grids/Notifiers/GridNotifiers.h
@@ -146,7 +146,8 @@ namespace Trinity
             if (!plr->HaveAtClient(i_source))
                 return;
 
-            plr->GetSession()->SendPacket(i_message);
+            if (WorldSession* session = plr->GetSession())
+                session->SendPacket(i_message);
         }
     };