Here is the relevant output:
*** unhandled exception in callback: *** Undefined subroutine &main::min called at /usr/bin/shutter line 5861. *** ignoring at /usr/bin/shutter line 5872.
"use List::Util qw/ max min /;" was missing => fixed
Here is the relevant output:
*** unhandled exception in callback:
*** Undefined subroutine &main::min called at /usr/bin/shutter line 5861.
*** ignoring at /usr/bin/shutter line 5872.
"use List::Util qw/ max min /;" was missing => fixed