What is correct way to remove a tool from a backpack?

Hi guys! Sorry if I ask a stupid question, but I did not find it on the Internet. So i am working on an inventory that should stack same items - if picked up item already exists, it deletes it and adds +1 to the existing counter.

When it detects same item it Destroys it. After :Destroy() it shows this message in console "Something unexpectedly tried to set the parent of Apple to NULL while trying to set the parent of Apple. Current parent is Backpack."

It keeps the tool object, but removes all his children, so i need to run another function to check for empty tools and destroy them again. Is there a proper way to remove tools when added?

THANKS :)