Doctopus Error Assistance

[Michael Hardt]

Caught something:
property: message
value: [Cannot call method "getEmail" of null.]
property: name
value: [TypeError]
property: fileName
value: [coTeacherFunctions (Doctopus)]
property: lineNumber
value: [148]
property: stack
value: [ at coTeacherFunctions (Doctopus):148
at utilities (Doctopus):1964 (call_)
at coTeacherFunctions (Doctopus):147 (getAssignmentOwner_)
at coTeacherFunctions (Doctopus):22 (loggedInUserIsAssignmentOwner)
at menus (Doctopus):236 (buildFullModeMenu)
at menus (Doctopus):2 (initialize_)
at menus (Doctopus):26 (launch)
]
toString(): value: [TypeError: Cannot call method "getEmail" of null.]