A script in luau can be running something in a place that i cannot yield apparently. This can crash the script in places it really shouldn't especially tight loops. local text = "1,2,3" for i=1,100000,1 do text:match("([^,]+),([^,]+),([^,]+)") end Reliably throws Object [script:New Script] Script run-time error Unable to perform mandatory yield [C] function match This script is a basic example that can trigger it. This can be caught with pcall... but it'd be nice if we didn't have too function test() local text = "1,2,3" for i=1,100000,1 do text:match("([^,]+),([^,]+),([^,]+)") end end ll.OwnerSay("Script Starts") pcall(test) ll.OwnerSay("Script Continues")