How to reproduce:

• use two screens
• start a medley (I used 3 players)
• complete the final song (can just Ctrl^Right through the whole thing)

Expected result:

• game goes to the screen where the scores are shown

Actual result:

• EAccessViolation

Details:

• it does work only 1 screen and everything else (number of players, used songs, etc) exactly the same, so it's probably related to the number of screens.