Merge pull request #508 from Hoikas/crash

Fix SittingModifier null dereference

Sources/Plasma/PubUtilLib/plAvatar/plSittingModifier.cpp

@@ -156,6 +156,7 @@ bool plSittingModifier::MsgReceive(plMessage *msg)
                 // own notify messages -- 
                 plKey avatarKey = notifyMsg->GetAvatarKey();
                 plSceneObject * obj = plSceneObject::ConvertNoRef(avatarKey->ObjectIsLoaded());
+                if (obj) {
                     const plArmatureMod * avMod = (plArmatureMod*)obj->GetModifierByType(plArmatureMod::Index());
                     plAvBrainHuman *brain = (avMod ? plAvBrainHuman::ConvertNoRef(avMod->GetCurrentBrain()) : nil);
                     if (brain && !brain->IsRunningTask())
@@ -182,6 +183,7 @@ bool plSittingModifier::MsgReceive(plMessage *msg)
                         Trigger(avMod, notifyEnter, notifyExit);
                     }
                 }
+            }
             // eat the message either way
             result = true;
         } else if (notifyMsg->fState == 0.0f && msg->GetSender() == GetKey()) {
@@ -196,6 +198,7 @@ bool plSittingModifier::MsgReceive(plMessage *msg)
             {
                 plKey avatarKey = notifyMsg->GetAvatarKey();
                 plSceneObject * obj = plSceneObject::ConvertNoRef(avatarKey->ObjectIsLoaded());
+                if (obj) {
                     plArmatureMod * avMod = (plArmatureMod*)obj->GetModifierByType(plArmatureMod::Index());
 
                     uint32_t flags = kBCastToClients | kUseRelevanceRegions | kForceFullSend;
@@ -203,6 +206,7 @@ bool plSittingModifier::MsgReceive(plMessage *msg)
                 }
             }
         }
+    }
 
     return result || plSingleModifier::MsgReceive(msg);
 }