diff --git a/src/github/types/state-validation-payload.ts b/src/github/types/state-validation-payload.ts
index dd78f8b..bf78e3b 100644
--- a/src/github/types/state-validation-payload.ts
+++ b/src/github/types/state-validation-payload.ts
@@ -20,7 +20,7 @@ const validationErrorSchema = Type.Object({
 });
 
 export const pluginValidationResponseSchema = Type.Object({
-  message: Type.String(),
+  message: Type.Optional(Type.String()),
   errors: Type.Optional(Type.Array(validationErrorSchema)),
 });