diff --git a/src/CommonITILTask.php b/src/CommonITILTask.php
index 2c695710ccf..ef4b49e9a2d 100644
--- a/src/CommonITILTask.php
+++ b/src/CommonITILTask.php
@@ -1283,7 +1283,11 @@ public static function genericPopulatePlanning($itemtype, $options = [])
 
                       /// Specific for tickets
                         $interv[$key]["device"] = [];
-                        if (isset($parentitem->hardwaredatas) && !empty($parentitem->hardwaredatas)) {
+                        if (
+                            $parentitem instanceof Ticket
+                            && isset($parentitem->hardwaredatas)
+                            && !empty($parentitem->hardwaredatas)
+                        ) {
                             foreach ($parentitem->hardwaredatas as $hardwaredata) {
                                 $interv[$key]["device"][$hardwaredata->fields['id']] = ($hardwaredata
                                                    ? $hardwaredata->getName() : '');