[Script] Completely Safe Values in Vars?

I want to know some safe vars with their value.

I tried more than 100 values but got no success,

and I have also checked Karate Kid's tutorial
for safe vars
but these vars also causes

glitched text in never stopping message box
game freeze after script
continuously running script.

So I just want some safe values in vars.

Please & Thanks

Sounds like you are using a level script and forgot to do the last part of this tutorial

https://www.pokecommunity.com/showpost.php?p=4414826&postcount=86