diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index a45130010a3..56a85f5d03d 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -1600,7 +1600,7 @@ function top_htmlhead($head, $title = '', $disablejs = 0, $disablehead = 0, $arr
 			dolibarr_set_const($db, "MAIN_IHM_PARAMS_REV", ((int) $conf->global->MAIN_IHM_PARAMS_REV) + 1, 'chaine', 0, '', $conf->entity);
 		}
 
-		$themeparam = '?lang='.$langs->defaultlang.'&theme='.$conf->theme.(GETPOST('optioncss', 'aZ09') ? '&optioncss='.GETPOST('optioncss', 'aZ09', 1) : '').'&'.(!empty($user->id) ? ('userid='.$user->id.'&amp') : '').';entity='.$conf->entity;
+		$themeparam = '?lang='.$langs->defaultlang.'&theme='.$conf->theme.(GETPOST('optioncss', 'aZ09') ? '&optioncss='.GETPOST('optioncss', 'aZ09', 1) : '').(empty($user->id) ? '' : ('&userid='.$user->id) : '').'&entity='.$conf->entity;
 
 		$themeparam .= ($ext ? '&'.$ext : '').'&revision='.getDolGlobalInt("MAIN_IHM_PARAMS_REV");
 		if (GETPOSTISSET('dol_hide_topmenu')) {