diff --git a/htdocs/comm/action/card.php b/htdocs/comm/action/card.php
index 6d4d4f5011096..8ef1b664a29f7 100644
--- a/htdocs/comm/action/card.php
+++ b/htdocs/comm/action/card.php
@@ -548,7 +548,7 @@
 
 		if ($idaction > 0) {
 			if (!$object->error) {
-				if (count($listofresourceid)) {
+				if (is_array($listofresourceid) && count($listofresourceid)) {
 					foreach ($listofresourceid as $resource_id => $val) {
 						$resource_type = 'dolresource';
 						$busy = 1;//GETPOSTINT('busy');