My replays are randomly being corrupted and sometimes i just can't save replays

Is that Steam version or standalone? Do you get the error whenever you try to save, or does that only happen after some specific actions? Error indicates that something went wrong when opening new ui and thus one of global variables is undefined.

If you're on Steam, try verifying cache integrity first. If it still doesn't work, you can try replacing your replay_save.lua (located in data/script/system/ folder) with this version of it.

It's the stand alone version it happens at random times I can save half the time. also the replay used to be in -30 grav but after I saved it it somehow got turned into the default gravity and I've gotten other issues of it changing other aspects of a replay like ukes position not just gravity this is after i save it to the my replays folder then upload it somewhere specifically (discord) then try to open it from in-game