[Koha-devel] Bug in "Add to list" feature

Hello, I've recently imported data from our old library system to Koha version 3 on Linux. When someone opens a bibliographic record in the Koha management interface, and clicks "add to list", a popup window appears with the following error: Can't use string ("1") as an ARRAY ref while "strict refs" in use at /usr/share/koha/intranet/cgi-bin/virtualshelves/addbybiblionumber.pl line 101. Does anyone know how I can fix this problem? Thanks very much, Jason