fix the attend code 500 error
fix the attend code 500 error

jtakayama/ics691-setupbooster,yongwen/makahiki,jtakayama/makahiki-draft,jtakayama/makahiki-draft,csdl/makahiki,csdl/makahiki,yongwen/makahiki,jtakayama/makahiki-draft,jtakayama/ics691-setupbooster,yongwen/makahiki,csdl/makahiki,yongwen/makahiki,csdl/makahiki,justinslee/Wai-Not-Makahiki,jtakayama/ics691-setupbooster,jtakayama/makahiki-draft