ircd crash in load/ircd/server.js line 426: TypeError: origin.setusermode is not a function

Not sure what triggered this, but here's the relevant log lines:

Sep 27 20:13:05 git jsexec[179943]: [RAW->extricat.synchro.net]: :DigitalMan SJOIN 0 #synchronet
Sep 27 20:13:05 git jsexec[179943]: [RAW->magnumuk.synchro.net]: :DigitalMan SJOIN 0 #synchronet
Sep 27 20:13:06 git jsexec[179943]: [cvs.synchro.net<-vert.synchro.net]: :vert.synchro.net MODE 1695864766 #SynchronetFans -n
Sep 27 20:13:06 git jsexec[179943]: !JavaScript  /sbbs/exec/load/ircd/server.js line 426: TypeError: origin.setusermode is not a function
Sep 27 20:13:06 git jsexec[179943]: !JavaScript  /sbbs/exec/load/ircd/server.js line 426: TypeError: origin.setusermode is not a function
Sep 27 20:13:06 git jsexec[179943]: /sbbs/exec/ircd.js executed in 5622821.88 seconds