Got this error while trying to save my set, the same thing happens when I "save as" as well

[Hedgylol]

[Window Title]
Error

[Main Instruction]
An internal error occured:

[Content]
referencing a nonexistant file
Please save your work (use 'save as' to so you don't overwrite things)
and restart Magic Set Editor.

You should leave a bug report on https://github.com/twanvl/MagicSetEditor2/issues/
Press Ctrl+C to copy this message to the clipboard.

Call stack:
[00] 00007FF689395567
[01] 00007FF689399784
[02] 00007FF689399C80
[03] 00007FF6891F7493
[04] 00007FF6891DBC8C
[05] 00007FF689217BF5
[06] 00007FF689254C47
[07] 00007FF689256B0C
[08] 00007FF68939E3C2
[09] 00007FF68939CB01
[10] 00007FF689220A95
[11] 00007FF689219A77
[12] 00007FF6892F7122
[13] 00007FF6893353EC
[14] 00007FF6895812B4
[15] 00007FF6895AFFB4
[16] 00007FF6895B11E3
[17] 00007FF6895AFEB8
[18] 00007FF68941357E
[19] 00007FF6895AFF0C
[20] 00007FF6895B0D3A

[OK]