diff --git a/apps/maarch_entreprise/actions/sendToExternalSignatureBook.php b/apps/maarch_entreprise/actions/sendToExternalSignatureBook.php
index 8c46540d5fb1bdafe44b05337650d2d0281f9675..b49c09c9d40f0a3efc3f1e41f104b46a4585a294 100644
--- a/apps/maarch_entreprise/actions/sendToExternalSignatureBook.php
+++ b/apps/maarch_entreprise/actions/sendToExternalSignatureBook.php
@@ -154,7 +154,7 @@ function manage_form($arr_id, $history, $id_action, $label_action, $status, $col
             }
         }
 
-        if($attachmentToFreeze !== false) {
+        if (!empty($attachmentToFreeze)) {
             foreach ($attachmentToFreeze as $resId => $externalId) {
                 \Attachment\models\AttachmentModel::freezeAttachment([
                     'resId' => $resId,