[Koha] Patron has had overdue items and is blocked for 6480 day(s).

Dear Friends, One of my friend using Koha 3.6.4. He got following message when check out a book after check in overdue items (He paid Fine amount). "Patron has had overdue items and is blocked for 6480 day(s)" Kindly give me a solution. Regards, -- Vimal Kumar V. Mahatma Gandhi University Library Kottayam, Kerala- 686 560 Web: http://www.vimalkumar.org Blog: http://linuxhalwa.blogspot.com http://kohageek.blogspot.in --------------------------------------------------------------------------- "I forget what I was taught. I only remember what I have learnt" -Patrick White