diff --git a/back/methods/dms/saveSign.js b/back/methods/dms/saveSign.js
index 06b5b3caf1..7c69db3555 100644
--- a/back/methods/dms/saveSign.js
+++ b/back/methods/dms/saveSign.js
@@ -170,7 +170,7 @@ module.exports = Self => {
                             fs.writeFile(image, signContent, 'base64', async function(err) {
                                 if (err) {
                                     await tx.rollback();
-                                    return 'ERROR';
+                                    return err.message;
                                 }
                             });
                         }
@@ -189,7 +189,7 @@ module.exports = Self => {
             return 'OK';
         } catch (err) {
             await tx.rollback();
-            return 'ERROR';
+            throw err.message;
         }
     };
 };