diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f42bf7..051c4d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Fix image (field : description) in to pdf
 - Fix massive action PDF export redirecting to item list instead of generating the PDF
+- Fix group and group technician display name
 
 ## [4.1.2] - 2026-01-08
 
diff --git a/inc/appliance.class.php b/inc/appliance.class.php
index bbee4b1..7cdd9cd 100644
--- a/inc/appliance.class.php
+++ b/inc/appliance.class.php
@@ -154,10 +154,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Appliance $item)
             sprintf(
                 __s('%1$s: %2$s'),
                 '<b><i>' . __s('Group in charge of the hardware') . '</i></b>',
-                Toolbox::stripTags(Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $item->fields['groups_id_tech'],
-                )),
+                Toolbox::stripTags(PluginPdfCommon::getGroupDisplayName($item->fields['groups_id_tech'] ?? [], true)),
             ),
         );
 
@@ -183,10 +180,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Appliance $item)
             sprintf(
                 __s('%1$s: %2$s'),
                 '<b><i>' . __s('Group') . '</i></b>',
-                Toolbox::stripTags(Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $item->fields['groups_id'],
-                )),
+                Toolbox::stripTags(PluginPdfCommon::getGroupDisplayName($item->fields['groups_id'] ?? [], true)),
             ),
         );
 
diff --git a/inc/cartridgeitem.class.php b/inc/cartridgeitem.class.php
index 63a09db..b1977b9 100644
--- a/inc/cartridgeitem.class.php
+++ b/inc/cartridgeitem.class.php
@@ -95,10 +95,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, CartridgeItem $cartitem)
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
                 __s('Group in charge of the hardware') . '</i></b>',
-                Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $cartitem->fields['groups_id_tech'],
-                ),
+                PluginPdfCommon::getGroupDisplayName($cartitem->fields['groups_id_tech'] ?? []),
             ),
         );
 
diff --git a/inc/common.class.php b/inc/common.class.php
index a883614..b48dbe9 100644
--- a/inc/common.class.php
+++ b/inc/common.class.php
@@ -59,7 +59,7 @@ public function addStandardTab($itemtype, array &$ong, array $options)
             $withtemplate = $options['withtemplate'];
         }
 
-        if (!is_numeric($itemtype) && ($obj = $dbu->getItemForItemtype($itemtype)) && (method_exists($itemtype, 'displayTabContentForPDF'))) {
+        if (($obj = $dbu->getItemForItemtype($itemtype)) && (method_exists($itemtype, 'displayTabContentForPDF'))) {
             $titles = $obj->getTabNameForItem($this->obj, $withtemplate);
             if (!is_array($titles)) {
                 $titles = [1 => $titles];
@@ -420,6 +420,27 @@ final public function generatePDF($tab_id, $tabs, $page = 0, $render = true)
         }
     }
 
+    // This helper accepts both formats: the old one (int) and the new one (array).
+    //This is for compatibility with other item types that do not use the AssignableItem trait.
+    public static function getGroupDisplayName(array|int $group_ids, bool $strip_tags = false): string
+    {
+        if (!is_array($group_ids)) {
+            $group_ids = $group_ids > 0 ? [$group_ids] : [];
+        }
+        $group_ids = array_filter(array_map('intval', $group_ids), static fn($id) => $id > 0);
+        if ($group_ids === []) {
+            $name = Dropdown::getDropdownName('glpi_groups', 0);
+            return $strip_tags ? Toolbox::stripTags($name) : $name;
+        }
+        $names = array_map(
+            static fn($id) => $strip_tags
+                ? Toolbox::stripTags(Dropdown::getDropdownName('glpi_groups', $id))
+                : Dropdown::getDropdownName('glpi_groups', $id),
+            $group_ids,
+        );
+        return implode(', ', $names);
+    }
+
     public static function mainTitle(PluginPdfSimplePDF $pdf, $item)
     {
         $pdf->setColumnsSize(50, 50);
@@ -509,10 +530,7 @@ public static function mainLine(PluginPdfSimplePDF $pdf, $item, $field)
                     '<b><i>' . sprintf(
                         __s('%1$s: %2$s'),
                         __s('Group in charge of the hardware') . '</i></b>',
-                        Dropdown::getDropdownName(
-                            'glpi_groups',
-                            $item->fields['groups_id_tech'],
-                        ),
+                        self::getGroupDisplayName($item->fields['groups_id_tech'] ?? []),
                     ),
                     '<b><i>' . sprintf(
                         __s('%1$s: %2$s'),
diff --git a/inc/computer.class.php b/inc/computer.class.php
index c8851cf..57e103e 100644
--- a/inc/computer.class.php
+++ b/inc/computer.class.php
@@ -89,10 +89,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Computer $computer)
             '<b><i>' . sprintf(
                 __('%1$s: %2$s'),
                 __('Group') . '</i></b>',
-                Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $computer->fields['groups_id'],
-                ),
+                PluginPdfCommon::getGroupDisplayName($computer->fields['groups_id'] ?? []),
             ),
             '<b><i>' . sprintf(__('%1$s: %2$s'), __('UUID') . '</i></b>', $computer->fields['uuid']),
         );
diff --git a/inc/consumableitem.class.php b/inc/consumableitem.class.php
index 991a641..9461fcc 100644
--- a/inc/consumableitem.class.php
+++ b/inc/consumableitem.class.php
@@ -84,10 +84,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, ConsumableItem $consitem
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
                 __s('Group in charge of the hardware') . '</i></b>',
-                Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $consitem->fields['groups_id_tech'],
-                ),
+                PluginPdfCommon::getGroupDisplayName($consitem->fields['groups_id_tech'] ?? []),
             ),
         );
 
diff --git a/inc/software.class.php b/inc/software.class.php
index 21a3526..6432b95 100644
--- a/inc/software.class.php
+++ b/inc/software.class.php
@@ -93,9 +93,8 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Software $software)
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
                 __s('Group in charge of the hardware') . '</i></b>',
-                Dropdown::getDropdownName(
-                    'glpi_groups',
-                    $software->fields['groups_id_tech'],
+                PluginPdfCommon::getGroupDisplayName(
+                    $software->fields['groups_id_tech'] ?? [],
                 ),
             ),
             '<b><i>' . sprintf(
@@ -109,7 +108,7 @@ public static function pdfMain(PluginPdfSimplePDF $pdf, Software $software)
             '<b><i>' . sprintf(
                 __s('%1$s: %2$s'),
                 __s('Group') . '</i></b>',
-                Dropdown::getDropdownName('glpi_groups', $software->fields['groups_id']),
+                PluginPdfCommon::getGroupDisplayName($software->fields['groups_id'] ?? []),
             ),
         );