Leaderboard

As far as I understand from reading the wiki, it creates a GUI element. This means that you are to treat it as any other GUI element, not like dx functions. Basically, there's no need to render it yourself using onClientRender -> the resource does that for you. So, what your code does is that it's creating a new GUI element on every render, that's why you're not able to destroy it. You're only storing the latest instance of that GUI element inside of the blur variable.

local sx, sy = guiGetScreenSize() exports.blur_box:createBlurBox( 0, 0, sx, sy, 255, 255, 255, 255, false )