JodeRBX
commented
7 years ago NaN stands for Not a Number -- it's a quirk of how floating point numbers (decimals) are typically stored by computers. You'll find NaN when dividing by zero, raising zero to the zeroth power, and doing other undefined math operations. You can detect NaN programmatically by exploiting the fact that NaN ~= NaN (that is, 0/0 == 0/0 is false). In your case, though, you probably just want to set the position, velocity, and rotation back to sensible values.
Strange Bug Where the position gets stuck at something called Nan, if you zoom in to the effected model your cam will bug out. I have created a model that if you insert into your place and check the handle of the hat the char has you will see its position is Nan.
https://www.roblox.com/library/542042949/might-corrupt-save-files-broken