The thing that differs in release mode is that we throw away all the reverse-hash info to save memory. If you ever do things like local s = str(my_hash), that won’t work in release mode. We would have no means to know which string my_hash originated from. The above code you posted works fine as it’s in the end creating hashes, not strings. I have no idea what goput.lua is or what it does, but you can check that it never tries to get the string-values from hashes. Otherwise it might be the case that you do this in a different part of your code.