diff --git a/datamodels/2.x/itop-oauth-client/assets/js/oauth_connect.js b/datamodels/2.x/itop-oauth-client/assets/js/oauth_connect.js
index 4cc1c85d1..35dc4f391 100644
--- a/datamodels/2.x/itop-oauth-client/assets/js/oauth_connect.js
+++ b/datamodels/2.x/itop-oauth-client/assets/js/oauth_connect.js
@@ -92,6 +92,8 @@ const OAuthConnect = function(sClass, sId, sAjaxUri) {
 		function (oData) {
 			if (oData.status === 'success') {
 				oOpenSignInWindow(oData.data.authorization_url, 'OAuth authorization')
+			} else {
+				alert(oData.error_description);
 			}
 		}
 	);
diff --git a/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php b/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php
index 4ec94b2f6..bfb47282b 100644
--- a/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php
+++ b/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php
@@ -10,6 +10,7 @@ use cmdbAbstractObject;
 use Combodo\iTop\Application\TwigBase\Controller\Controller;
 use Combodo\iTop\Core\Authentication\Client\OAuth\OAuthClientProviderFactory;
 use Dict;
+use Exception;
 use IssueLog;
 use League\OAuth2\Client\Provider\Exception\IdentityProviderException;
 use MetaModel;
@@ -31,8 +32,13 @@ class AjaxOauthClientController extends Controller
 
 		$aResult = ['status' => 'success', 'data' => []];
 
-		$sAuthorizationUrl = OAuthClientProviderFactory::GetAuthorizationUrl($oOAuthClient);
-		$aResult['data']['authorization_url'] = $sAuthorizationUrl;
+        try {
+            $sAuthorizationUrl = OAuthClientProviderFactory::GetAuthorizationUrl($oOAuthClient);
+            $aResult['data']['authorization_url'] = $sAuthorizationUrl;
+        } catch (Exception $oException) {
+            $aResult['status'] = 'error';
+            $aResult['error_description'] = $oException->getMessage();
+        }
 
 		$this->DisplayJSONPage($aResult);
 	}