bug fixed

services/loopback/common/methods/ticket/getSalesPersonMana.js

@@ -33,6 +33,6 @@ module.exports = Self => {
         });
         let mana = await Self.app.models.WorkerMana.findOne({where: {workerFk: ticket[0].client().salesPersonFk}, fields: 'amount'});
 
-        return mana.amount | 0;
+        return mana ? mana.amount : 0;
     };
 };