Program aborts after saving the game and then trying to set the tray

[forgottenbutnotgone]

./scrabble play -b wwf -p vic -p me -g wwf
Available pieces: I(1) E(1) D(2) U(2) T(1) C(4) E(1)

save game
Available pieces: I(1) E(1) D(2) U(2) T(1) C(4) E(1)
set-tray ANYTEXT
terminate called after throwing an instance of 'Assert_Exception'
what(): /home/user/Desktop/scrabble-master/scrabble_piece.hpp:135 For object: I
Should not have been output already

./pv: line 1: 11387 Aborted (core dumped) ./scrabble play -b wwf -p vic -p me -g wwf

[forgottenbutnotgone]

I forgot to mention that you can play moves and set the tray as often as you like, but once you have saved the board, the next time you try to set the tray at any point in the future the program aborts with a core dump as above.