diff --git a/src/core/src/apis/group.ts b/src/core/src/apis/group.ts
index a121ba84..37614f26 100644
--- a/src/core/src/apis/group.ts
+++ b/src/core/src/apis/group.ts
@@ -125,7 +125,7 @@ export class NTQQGroupApi {
           'seq': seq,  // 通知序列号
           'type': type,
           'groupCode': groupCode,
-          'postscript': reason || ''
+          'postscript': reason || ' ' // 仅传空值可能导致处理失败，故默认给个空格
         }
       });
   }
diff --git a/src/onebot11/action/group/SetGroupAddRequest.ts b/src/onebot11/action/group/SetGroupAddRequest.ts
index f9d016e0..3f079ff1 100644
--- a/src/onebot11/action/group/SetGroupAddRequest.ts
+++ b/src/onebot11/action/group/SetGroupAddRequest.ts
@@ -9,7 +9,7 @@ const SchemaData = {
   properties: {
     flag: { type: 'string' },
     approve: { type: ['string', 'boolean'] },
-    reason: { type: 'string' }
+    reason: { type: 'string', nullable: true, }
   },
   required: ['flag'],
 } as const satisfies JSONSchema;