diff --git a/src/tasks/base/ITask.ts b/src/tasks/base/ITask.ts
index 8bf2726..cf9e6bc 100644
--- a/src/tasks/base/ITask.ts
+++ b/src/tasks/base/ITask.ts
@@ -32,12 +32,12 @@ export abstract class ITask {
     if (!cfg.score) {
       return
     }
-    let claimAmount = task.data.claimAmount || 0
+    let claimAmount = task.data?.claimAmount || 0
     let score = cfg.score
     if (user.boost > 1 && Date.now() < user.boostExpire.getTime()) {
       score = Math.floor(score * user.boost)
     }
-    let finishAmount = cfg.repeat > 1 ? task.data.finishAmount || 0 : 1
+    let finishAmount = cfg.repeat > 1 ? task.data?.finishAmount || 0 : 1
     for (let i = claimAmount; i < Math.min(cfg.repeat, finishAmount); i++) {
       await updateRankScore({
         user: user.id,
@@ -52,7 +52,7 @@ export abstract class ITask {
       })
       claimAmount += 1
     }
-    task.data.claimAmount = claimAmount
+    task.data = Object.assign(task.data || {}, { claimAmount })
     task.markModified('data')
     if ((cfg.repeat > 1 && claimAmount >= cfg.repeat) || (cfg.repeat === 1 && claimAmount >= 1)) {
       task.status = TaskStatusEnum.CLAIMED