Create participant in meetings-management not working

[kristinriebe]

Via GUI: Admin -> Meetings Management -> Manage participants
When clicking "Create new participant" the form is not shown and there is following error message in the console (Chromium Browser):
TypeError: Cannot read property '1' of null
at daiquiri.js:308
at Object.s as forEach
at Object.fn (daiquiri.js:308)
at l.c.$get.l.$digest (daiquiri.js:133)
at l.c.$get.l.$apply (daiquiri.js:136)
at l (daiquiri.js:91)
at O (daiquiri.js:96)
at XMLHttpRequest.w.onload (daiquiri.js:97)

(Found at rds2015/meetings/workshop/participants.)