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-rw-r--r--IkiWiki/Plugin/attachment.pm3
1 files changed, 2 insertions, 1 deletions
diff --git a/IkiWiki/Plugin/attachment.pm b/IkiWiki/Plugin/attachment.pm
index cb762e453..90e0f0f0b 100644
--- a/IkiWiki/Plugin/attachment.pm
+++ b/IkiWiki/Plugin/attachment.pm
@@ -34,7 +34,8 @@ sub formbuilder_setup (@) { #{{{
# Start with the attachments interface toggled invisible,
# but if it was used, keep it open.
if ($form->submitted ne "Upload Attachment" &&
- ! length $q->param("attachment_select")) {
+ (! defined $q->param("attachment_select") ||
+ ! length $q->param("attachment_select"))) {
$form->tmpl_param("attachments-class" => "toggleable");
}
else {