diff --git a/htdocs/asset/card.php b/htdocs/asset/card.php
index 50e09831bff..4cae73edafd 100644
--- a/htdocs/asset/card.php
+++ b/htdocs/asset/card.php
@@ -221,7 +221,7 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 		$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?id=' . $object->id, $langs->trans('XXX'), $text, 'confirm_xxx', $formquestion, 0, 1, 220);
 	}
 
-	if (! $formconfirm) {
+	if (!empty($formconfirm)) {
 		$parameters = array('lineid' => $lineid);
 		$reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 		if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/comm/propal/card.php b/htdocs/comm/propal/card.php
index daaf9cd01f9..d0d14fe51c2 100644
--- a/htdocs/comm/propal/card.php
+++ b/htdocs/comm/propal/card.php
@@ -1827,7 +1827,7 @@ if ($action == 'create')
 			$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?id=' . $object->id, $langs->trans('ValidateProp'), $text, 'confirm_validate', '', 0, 1);
 	}
 
-	if (! $formconfirm) {
+	if (!empty($formconfirm)) {
 		$parameters = array('lineid' => $lineid);
 		$reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 		if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/commande/card.php b/htdocs/commande/card.php
index 10005f3004a..8baeb18c234 100644
--- a/htdocs/commande/card.php
+++ b/htdocs/commande/card.php
@@ -1967,7 +1967,7 @@ if ($action == 'create' && $user->rights->commande->creer)
 			$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?id=' . $object->id, $langs->trans('CloneOrder'), $langs->trans('ConfirmCloneOrder', $object->ref), 'confirm_clone', $formquestion, 'yes', 1);
 		}
 
-		if (! $formconfirm) {
+		if (!empty($formconfirm)) {
 			$parameters = array('lineid' => $lineid);
 			$reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 			if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index f2a137f0d8f..a1de09d9706 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -3600,7 +3600,7 @@ else if ($id > 0 || ! empty($ref))
 		$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?facid=' . $object->id, $langs->trans('CloneInvoice'), $langs->trans('ConfirmCloneInvoice', $object->ref), 'confirm_clone', $formquestion, 'yes', 1);
 	}
 
-	if (! $formconfirm)
+	if (!empty($formconfirm))
 	{
 		$parameters = array('lineid' => $lineid);
 		$reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
diff --git a/htdocs/expedition/card.php b/htdocs/expedition/card.php
index ea01148cc70..f560f3413ee 100644
--- a/htdocs/expedition/card.php
+++ b/htdocs/expedition/card.php
@@ -1676,7 +1676,7 @@ else if ($id || $ref)
 
 		}
 
-		if (! $formconfirm) {
+		if (!empty($formconfirm)) {
 		    $parameters = array();
 		    $reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 		    if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/expedition/shipment.php b/htdocs/expedition/shipment.php
index 0d3111d9f12..859f65ef8d7 100644
--- a/htdocs/expedition/shipment.php
+++ b/htdocs/expedition/shipment.php
@@ -258,7 +258,7 @@ if ($id > 0 || ! empty($ref))
 
 		}
 
-		if (! $formconfirm) {
+		if (!empty($formconfirm)) {
 		    $parameters = array();
 		    $reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 		    if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/modulebuilder/template/myobject_card.php b/htdocs/modulebuilder/template/myobject_card.php
index 04de3e1e40e..b2ba240aedd 100644
--- a/htdocs/modulebuilder/template/myobject_card.php
+++ b/htdocs/modulebuilder/template/myobject_card.php
@@ -274,7 +274,7 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 	    $formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?id=' . $object->id, $langs->trans('XXX'), $text, 'confirm_xxx', $formquestion, 0, 1, 220);
 	}
 
-	if (! $formconfirm) {
+	if (!empty($formconfirm)) {
 	    $parameters = array('lineid' => $lineid);
 	    $reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 	    if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/product/inventory/card.php b/htdocs/product/inventory/card.php
index d143aa4e3c8..37cf2ae7df8 100644
--- a/htdocs/product/inventory/card.php
+++ b/htdocs/product/inventory/card.php
@@ -224,7 +224,7 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 	    $formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?id=' . $object->id, $langs->trans('DeleteInventory'), $langs->trans('ConfirmDeleteOrder'), 'confirm_delete', '', 0, 1);
 	}
 
-	if (! $formconfirm) {
+	if (!empty($formconfirm)) {
 	    $parameters = array('lineid' => $lineid);
 	    $reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 	    if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/product/stock/card.php b/htdocs/product/stock/card.php
index 7e13364d7ca..33336bf6c21 100644
--- a/htdocs/product/stock/card.php
+++ b/htdocs/product/stock/card.php
@@ -298,7 +298,7 @@ else
 				$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"]."?id=".$object->id,$langs->trans("DeleteAWarehouse"),$langs->trans("ConfirmDeleteWarehouse",$object->libelle),"confirm_delete",'',0,2);
 			}
 
-			if (! $formconfirm) {
+			if (!empty($formconfirm)) {
 			    $parameters = array();
 			    $reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 			    if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/supplier_proposal/card.php b/htdocs/supplier_proposal/card.php
index fd74bcd2130..b312f9bd876 100644
--- a/htdocs/supplier_proposal/card.php
+++ b/htdocs/supplier_proposal/card.php
@@ -1372,7 +1372,7 @@ if ($action == 'create')
 			$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?id=' . $object->id, $langs->trans('ValidateAsk'), $text, 'confirm_validate', '', 0, 1);
 	}
 
-	if (! $formconfirm) {
+	if (!empty($formconfirm)) {
 		$parameters = array('lineid' => $lineid);
 		$reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 		if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;
diff --git a/htdocs/website/websiteaccount_card.php b/htdocs/website/websiteaccount_card.php
index 49009d8f4e7..caca5afc9ae 100644
--- a/htdocs/website/websiteaccount_card.php
+++ b/htdocs/website/websiteaccount_card.php
@@ -207,7 +207,7 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 	    $formconfirm = $form->formconfirm($_SERVER["PHP_SELF"] . '?id=' . $object->id, $langs->trans('DeleteWebsiteAccount'), $langs->trans('ConfirmDeleteWebsiteAccount'), 'confirm_delete', '', 0, 1);
 	}
 
-	if (! $formconfirm) {
+	if (!empty($formconfirm)) {
 	    $parameters = array('lineid' => $lineid);
 	    $reshook = $hookmanager->executeHooks('formConfirm', $parameters, $object, $action); // Note that $action and $object may have been modified by hook
 	    if (empty($reshook)) $formconfirm.=$hookmanager->resPrint;