diff --git a/src/types/plugin/outputs.ts b/src/types/plugin/outputs.ts
index f0cb8ce49a..d92f13ae5e 100644
--- a/src/types/plugin/outputs.ts
+++ b/src/types/plugin/outputs.ts
@@ -167,7 +167,7 @@ export const runResultSchema = Joi.object().keys({
   success: Joi.boolean().required(),
   startedAt: Joi.date().required(),
   completedAt: Joi.date().required(),
-  output: Joi.string().required(),
+  output: Joi.string().required().allow(""),
 })
 
 export interface TestResult extends RunResult {