diff --git a/modules/game_interface/gameinterface.lua b/modules/game_interface/gameinterface.lua
index fa791b4d..cd4fa795 100644
--- a/modules/game_interface/gameinterface.lua
+++ b/modules/game_interface/gameinterface.lua
@@ -394,7 +394,7 @@ function processMouseAction(menuPosition, mouseButton, autoWalkPos, lookThing, u
   else
     if multiUseThing and keyboardModifiers == KeyboardNoModifier and mouseButton == MouseRightButton and not g_mouse.isPressed(MouseLeftButton) then
       local player = g_game.getLocalPlayer()
-      if creatureThing ~= player then
+      if creatureThing and creatureThing ~= player then
         g_game.attack(creatureThing)
         return true
       elseif multiUseThing:isContainer() then