diff --git a/js/console_form_handler.js b/js/console_form_handler.js
index 7432157a90..6081764138 100644
--- a/js/console_form_handler.js
+++ b/js/console_form_handler.js
@@ -69,13 +69,23 @@ $(function()
                     json_obj: this.options.oWizardHelper.UpdateWizardToJSON()
                 },
                 function(data){
-                    me._onUpdateSuccess(data, sFormPath);
+                    if ('form' in data) {
+                        me._onUpdateSuccess(data, sFormPath);
+                    }
                 }
             )
             .fail(function(data){ me._onUpdateFailure(data, sFormPath); })
             .always(function(data){
                 me.alignColumns();
-                $(me.element.find('[data-form-path="' + sFormPath + '"]')).unblock();
+                var oContainer = $(me.element.find('[data-form-path="' + sFormPath + '"]'));
+                oContainer.unblock();
+                if ('error' in data) {
+                    oContainer.block({message: data.error});
+                    console.log('Update field failure: '+data.error);
+                    $('.blockOverlay').click(function(){
+                        oContainer.unblock();
+                    });
+                }
                 me._onUpdateAlways(data, sFormPath);
             });
         },
diff --git a/pages/ajax.render.php b/pages/ajax.render.php
index 5495d868dd..e070676240 100644
--- a/pages/ajax.render.php
+++ b/pages/ajax.render.php
@@ -2456,17 +2456,25 @@ EOF
 			$sRequestedFieldsFormPath = utils::ReadParam('form_path', '');
 			$sJson = utils::ReadParam('json_obj', '', false, 'raw_data');
 
-			$oWizardHelper = WizardHelper::FromJSON($sJson);
-			$oObj = $oWizardHelper->GetTargetObject();
-
-			$oOrmCustomFieldValue = $oObj->Get($sAttCode);
-			$oForm = $oOrmCustomFieldValue->GetForm();
-			$oSubForm = $oForm->FindSubForm($sRequestedFieldsFormPath);
-			$oRenderer = new \Combodo\iTop\Renderer\Console\ConsoleFormRenderer($oSubForm);
-			$aRenderRes = $oRenderer->Render($aRequestedFields);
-
 			$aResult = array();
-			$aResult['form']['updated_fields'] = $aRenderRes;
+
+			try
+			{
+				$oWizardHelper = WizardHelper::FromJSON($sJson);
+				$oObj = $oWizardHelper->GetTargetObject();
+
+				$oOrmCustomFieldValue = $oObj->Get($sAttCode);
+				$oForm = $oOrmCustomFieldValue->GetForm();
+				$oSubForm = $oForm->FindSubForm($sRequestedFieldsFormPath);
+				$oRenderer = new \Combodo\iTop\Renderer\Console\ConsoleFormRenderer($oSubForm);
+				$aRenderRes = $oRenderer->Render($aRequestedFields);
+
+				$aResult['form']['updated_fields'] = $aRenderRes;
+			}
+			catch (Exception $e)
+			{
+				$aResult['error'] = $e->getMessage();
+			}
 			$oPage->add(json_encode($aResult));
 			break;
 
diff --git a/sources/form/form.class.inc.php b/sources/form/form.class.inc.php
index 2171d4985b..df11ce2e40 100644
--- a/sources/form/form.class.inc.php
+++ b/sources/form/form.class.inc.php
@@ -413,7 +413,7 @@ class Form
 			{
 				if (!array_key_exists($sSomeId, $this->aFields))
 				{
-					throw new Exception('Missing dependancy : Field ' . $sImpactedBy . ' expecting field ' . $sSomeId . ' which is not in the Form');
+					throw new Exception('Unmet dependency : Field ' . $sImpactedBy . ' expecting field ' . $sSomeId . ' which is not in the Form');
 				}
 			}
 		}