(confirm_)fix a crash (#55346)

rationale: gtk+ may fire a signal before $box is initialized

2 files changed, 2 insertions, 1 deletions

diff --git a/NEWS b/NEWS
index 8843270a..51b0d9c1 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,6 @@
 - mdkapplet
   o add version to distribution list requests
+  o fix a crash (#55346)
 - mdkapplet-upgrade-helper
   o make sure utf8.pm is loaded before starting an upgrade (#55090)
 
diff --git a/mdkapplet b/mdkapplet
index 9d2a898c..8970c1a9 100755
--- a/mdkapplet
+++ b/mdkapplet
@@ -440,7 +440,7 @@ sub confirm_upgrade() {
                gtknew('CheckButton', text => N("Download all packages at once") . "\n" .
                         N("(Warning: You will need quite a lot of free space)"),
                       active_ref => \$download_all, sensitive_ref => \$browse,
-                      toggled => sub { $box->set_sensitive($download_all) },
+                      toggled => sub { $box and $box->set_sensitive($download_all) },
                   ),
                $box = gtknew('HBox', sensitive => $download_all,
                              children => [