[nicklist] Fix crash on scroll (#512)

Fix crash on scroll in windows other than channels (status, query etc.)
See #512 for issue details.

diff --git a/scripts/nicklist.pl b/scripts/nicklist.pl
index 2690e26ce63098f8107cf2c4544f306562808c6c..002a6201960602cefe7ca5a1bc58e77e0868ffc3 100755 (executable)
--- a/scripts/nicklist.pl
+++ b/scripts/nicklist.pl
@@ -22,7 +22,7 @@ use strict;
 use IO::Handle; # for (auto)flush
 use Fcntl; # for sysopen
 use vars qw($VERSION %IRSSI);
-$VERSION = '0.4.10';
+$VERSION = '0.4.11';
 %IRSSI = (
        authors     => 'Wouter Coekaerts',
        contact     => 'coekie@irssi.org',
@@ -30,7 +30,7 @@ $VERSION = '0.4.10';
        description => 'draws a nicklist to another terminal, or at the right of your irssi in the same terminal',
        license     => 'GPLv2',
        url         => 'http://wouter.coekaerts.be/irssi',
-       changed     => '2018-04-02'
+       changed     => '2018-06-02'
 );
 
 sub cmd_help {
@@ -658,6 +658,9 @@ sub recalc_nick {
 # scroll the nicklist, arg = number of lines to scroll, positive = down, negative = up
 sub cmd_scroll {
        my $channel = Irssi::active_win->{active};
+       if (!$channel || !$channel->can('nicks')) { # active window is not a channel
+               return;
+       }
        my @nicks = $channel->nicks;
        my $nick_count = scalar(@nicks)+0;