diff --git a/models/common.ts b/models/common.ts
index 9eaa15c..5a1dc7a 100644
--- a/models/common.ts
+++ b/models/common.ts
@@ -86,7 +86,10 @@ export default class Model extends TypeORM.BaseEntity {
     }
   }
 
+  async saveHook(): Promise<void> {}
+
   async save(): Promise<this> {
+    await this.saveHook();
     await super.save();
     if ((this.constructor as typeof Model).cache) {
       cacheSet(this.constructor.name, (this as any).id, this);
diff --git a/models/judge_state.ts b/models/judge_state.ts
index ad7868a..065f67f 100644
--- a/models/judge_state.ts
+++ b/models/judge_state.ts
@@ -97,7 +97,7 @@ export default class JudgeState extends Model {
 
   @TypeORM.Column({ nullable: true, type: "integer" })
   type_info: number;
-  
+
   @TypeORM.Index()
   @TypeORM.Column({ nullable: true, type: "boolean" })
   is_public: boolean;
@@ -114,6 +114,10 @@ export default class JudgeState extends Model {
     }
   }
 
+  async saveHook() {
+    if (this.score === null) this.score = 0;
+  }
+
   async isAllowedVisitBy(user) {
     await this.loadRelationships();