diff --git a/htdocs/product/stock/card.php b/htdocs/product/stock/card.php
index 0e7189ae038..8231be30d0c 100644
--- a/htdocs/product/stock/card.php
+++ b/htdocs/product/stock/card.php
@@ -447,7 +447,7 @@ if ($action == 'create') {
 						$morehtmlref .= '<input type="submit" class="button valignmiddle" value="'.$langs->trans("Modify").'">';
 						$morehtmlref .= '</form>';
 					} else {
-						$morehtmlref .= $form->form_project($_SERVER['PHP_SELF'].'?id='.$object->id, $object->socid, $object->fk_project, 'none', 0, 0, 0, 1);
+						$morehtmlref .= $form->form_project($_SERVER['PHP_SELF'].'?id='.$object->id, ($socid > 0 ? $socid : -1), $object->fk_project, 'none', 0, 0, 0, 1);
 					}
 				} else {
 					if (!empty($object->fk_project)) {