diff --git a/server/light_backtask/task/stacking_go.go b/server/light_backtask/task/stacking_go.go
index 980e6542..b967aff0 100644
--- a/server/light_backtask/task/stacking_go.go
+++ b/server/light_backtask/task/stacking_go.go
@@ -151,17 +151,17 @@ func (this *stackingCec) apply(idx int64, eventName string,
 	if dbErr != nil {
 		return false
 	}
+	srcAmount := "0"
 	if ds.Next() {
 		if idx <= q5.ToInt64(ds.GetByName("last_apply_record_idx")) {
 			return true
 		}
-		bnNewAmount, ok := new(big.Int).SetString(ds.GetByName("amount"), 10)
-		if !ok {
-			return false
-		}
-		bnNewAmount.Add(bnNewAmount, bnAmount)
-	} else {
-
+		srcAmount = ds.GetByName("amount")
 	}
+	bnNewAmount, ok := new(big.Int).SetString(srcAmount, 10)
+	if !ok {
+		return false
+	}
+	bnNewAmount.Add(bnNewAmount, bnAmount)
 	return true
 }