fix container update item

modules/game_containers/containers.lua

@@ -98,6 +98,7 @@ function Containers.onContainerUpdateItem(containerId, slot, item)
   local itemWidget = container:getChildByIndex(slot + 1)
   if not itemWidget then return end
   itemWidget:setItem(item)
+  item:setPos(itemWidget.position)
 end
 
 function Containers.onContainerRemoveItem(containerId, slot)

src/otclient/core/game.cpp

@@ -369,7 +369,12 @@ int Game::getThingStackpos(const ThingPtr& thing)
     // thing is at map
     if(thing->getPos().x != 65535) {
         TilePtr tile = g_map.getTile(thing->getPos());
-        return tile->getThingStackpos(thing);
+        if(tile)
+            return tile->getThingStackpos(thing);
+        else {
+            logError("could not get tile");
+            return -1;
+        }
     }
 
     // thing is at container or inventory