diff --git a/htdocs/comm/action/card.php b/htdocs/comm/action/card.php
index 245f90edf72..6862296d18b 100644
--- a/htdocs/comm/action/card.php
+++ b/htdocs/comm/action/card.php
@@ -1187,7 +1187,8 @@ if ($action == 'create') {
 		print img_picto('', 'project', 'class="pictofixedwidth"');
 		print $formproject->select_projects((!empty($societe->id) ? $societe->id : -1), $projectid, 'projectid', 0, 0, 1, 1, 0, 0, 0, '', 1, 0, 'maxwidth500 widthcentpercentminusxx');
 
-		print '&nbsp;<a href="'.DOL_URL_ROOT.'/projet/card.php?socid='.$societe->id.'&action=create&amp;backtopage='.urlencode($_SERVER["PHP_SELF"].'?action=create').'">';
+                //duplicating test from line above to remove PHP8 warning
+		print '&nbsp;<a href="'.DOL_URL_ROOT.'/projet/card.php?socid='.(!empty($societe->id) ? $societe->id: -1).'&action=create&amp;backtopage='.urlencode($_SERVER["PHP_SELF"].'?action=create').'">';
 		print '<span class="fa fa-plus-circle valignmiddle paddingleft" title="'.$langs->trans("AddProject").'"></span></a>';
 		$urloption = '?action=create&donotclearsession=1';
 		$url = dol_buildpath('comm/action/card.php', 2).$urloption;