diff --git a/datamodels/2.x/itop-portal-base/portal/src/Helper/NavigationRuleHelper.php b/datamodels/2.x/itop-portal-base/portal/src/Helper/NavigationRuleHelper.php
index b8cb6f946..bc52c4f40 100644
--- a/datamodels/2.x/itop-portal-base/portal/src/Helper/NavigationRuleHelper.php
+++ b/datamodels/2.x/itop-portal-base/portal/src/Helper/NavigationRuleHelper.php
@@ -569,7 +569,7 @@ class NavigationRuleHelper
 		);
 
 		// Get form's navigation rules
-		$aFormNavRules = (isset($aFormProperties['properties'])) ? $aFormProperties['properties']['navigation_rules'] : array('submit' => null, 'cancel' => null);
+		$aFormNavRules = (isset($aFormProperties['properties']['navigation_rules'])) ? $aFormProperties['properties']['navigation_rules'] : array('submit' => null, 'cancel' => null);
 
 		// Check from which origin the rule will be called
 		$sRuleCallOrigin = ($bIsCurrentFormInModal) ? 'modal' : 'default';