Not sure if i'm doing something wrong or if this is a bug but when piping JTR to aircrack-ng with BT4 beta:

john --incremental=alnum --stdout | aircrack-ng -b <AP Mac> -w - /root/dump-01.cap

aircrack-ng starts then locks up with 0 seconds run time, 20 keys tested and on Current Passphrase: --session=NAME

Am I doing something wrong or does this appear to be a software issue? Thanks!