I was obviously too quick to enjoy life

Dynamic album was working fine, there were 108 pages each with 24 thumbs and I was able to browse them, but then all of a sudden I now only get
Warning: array_slice() [function.array-slice]: The first argument should be an array in /var/www/vhosts/fotografer.de/httpdocs/mag/zp-core/class-album.php on line 424
Without any changes in the meantime...

Any idea what could be a reason?