fixed-point overflow Warning?

83263: [16-06-08 10:29:37.7319] Slim::Utils::Misc::msg (1244) Warning: [10:29:37.7308] fixed-point overflow: -1540296704 444620800 519987200 -1019478016

I have never seen this warning before on any LMS version. Currently on:

Logitech Media Server Version: 7.9.0 - 1464986354 @ Sat Jun 4 04:07:05 UTC 2016
Hostname: Qnap-TS239-Pro
Server IP Address: 192.168.1.132
Server HTTP Port Number: 9001
Operating system: Linux - EN - utf8
Platform Architecture: i686-linux
Perl Version: 5.10.0 - i686-linux-thread-multi
Audio::Scan: 0.95
Database Version: DBD::SQLite 1.34_01 (sqlite 3.7.7.1)