[toggle_hidelevel] get rid of undefined warning

diff --git a/scripts/toggle_hidelevel.pl b/scripts/toggle_hidelevel.pl
index 27bded77f611b446096d196f2e40b267a81e3b15..88495cb95811a1a626ced0b1404112472e5579c6 100644 (file)
--- a/scripts/toggle_hidelevel.pl
+++ b/scripts/toggle_hidelevel.pl
@@ -41,7 +41,7 @@ sub set_mode_all {
 sub set_mode {
   my ($win, $mode) = @_;
   my $lvlbits = $win->view->{hidden_level} || $windows->{$win->{refnum}}{levels};
-  my $levels = Irssi::bits2level($lvlbits);
+  my $levels = Irssi::bits2level($lvlbits // 0);
   my $val;
 
   $levels = Irssi::settings_get_str('window_default_hidelevel') if $mode && !$lvlbits;