[Koha] software error

[hira.akram at almusnet.com]

Hi,
I added an item on hold ( that was checked out) from OPAC view. It was appearing in the list of "holds to pull" from staff view. but when i checked in the item and tried to view holds again, I opened page of "holds awaiting pickup" it shows me software error page. 
"" 
Can't call method "description" on an undefined value at /usr/share/koha/intranet/cgi-bin/circ/waitingreserves.pl line 124.
 
"""
What might be the issue and how it can be solved?
 
Thanks