I don’t know if that’s it, but changing inventory.Items[i] = nil to table.remove(inventory.Items,i) fixes it? I am not sure how I encounter it in the first time honestly, what do you say?
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I’m assuming inventory.Items is an array even though you’re using pairs instead of ipairs.
If Items table is an array (numeric indices) then they have to be in order from 1 to x in order to be able to pass it to the client and go across the server-client boundary, so instead of doing inventory.Items[i] = nil try doing table.remove(inventory.Items,i)
Just read your reply and yeah that’s the issue, here’s a post about it "Invalid table key type used" When Firing RemoteFunction - #3 by EncodedLua
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It’s my first time going in-depth into creating a proper inventory system, and the dev forums helped me so much! 
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If you would like direct help through discord I can do that aswell rather than flooding/posting on the same thread or waiting for me to open devforum!
Sure, I didn’t see this response from 5 days ago, i’ll just DM my discord to you or if you got a general chatting server.