             target_users.map (_, account_id) =>
                 if not users?.get(account_id)?
                     invite(account_id)
-            # Make sure nobody else is on the student's project (anti-cheating measure)
-            flux.getStore('projects').get_users(student_project_id).map (_,account_id) =>
+            # Make sure nobody else is on the student's project (anti-cheating measure) -- but only if project
+            # already created.
+            flux.getStore('projects').get_users(student_project_id)?.map (_,account_id) =>
                 if not target_users.get(account_id)? and account_id != student_account_id
                     flux.getActions('projects').remove_collaborator(student_project_id, account_id)
 

    render_student_info: (info) ->
        <Row >
            <Col md=4 key='last_assignment'>
                {@render_event('Assigned', info.last_assignment)}
            </Col>
            <Col md=4 key='collect'>
                {@render_event('Collected', info.collect)}
            </Col>
            <Col md=4 key='return_graded'>
                {@render_event('Returned', info.return_graded)}
            </Col>
        </Row>


        user_map   : rtypes.object.isRequired
        info       : rtypes.func.isRequired

    render_last: (name, obj) ->
        v = [<span key='name'>{name+': '}</span>]
        if obj?
            if obj.time?
