diff --git a/app/controllers/api/functions.php b/app/controllers/api/functions.php
index 764de936d..d8fc0a39a 100644
--- a/app/controllers/api/functions.php
+++ b/app/controllers/api/functions.php
@@ -1341,7 +1341,7 @@ App::post('/v1/functions/:functionId/variables')
         try {
             $variable = $dbForProject->createDocument('variables', $variable);
         } catch (DuplicateException $th) {
-            throw new Exception(Exception::VARIABLE_ALREADY_EXISTS, 'Variable key already used.');
+            throw new Exception(Exception::VARIABLE_ALREADY_EXISTS);
         }
 
         $dbForProject->deleteCachedDocument('functions', $function->getId());