I found it last night when I was trying to pass the ULD progress from one character to another. And an unit error came up in masterlootindicator at line 56.

How to replicate:
Use one character to create a premade group in game and check the autoaccept, then offline.
Switch to second character to join the group and convert it to raid in masterloot (it may take 5 minutes to wait for system to pass the leader).
After that, leave the raid, go offline and turn back to previous character. You would get the error.
I dumped GetLootMethod, only return the first value.