Hi, thanks for reply. I have little problem with destroying blur box. What I did wrong in code?
 
addEventHandler("onClientRender", root, function() 
    local sx, sy = guiGetScreenSize()
    blur = exports.blur_box:createBlurBox( 0, 0, sx, sy, 255, 255, 255, 255, false )
    blur = exports.blur_box:setBlurIntensity(3)
end)
addEventHandler("onClientResourceStop", root, function ()
    exports.blur_box:destroyBlurBox(blur)
    removeEventHandler('onClientRender', root function()) 
end)