diff --git a/server/light_backtask/service/vip.go b/server/light_backtask/service/vip.go
index 44e3ea23..e7b502c8 100644
--- a/server/light_backtask/service/vip.go
+++ b/server/light_backtask/service/vip.go
@@ -61,6 +61,9 @@ func (this *vip) Add(accountAddress string, val string, idx int64, valField stri
 		}
 		bnOldVal, _ := new(big.Int).SetString(ds.GetByName(valField), 10)
 		bnVal, _ := new(big.Int).SetString(val, 10)
+		if bnOldVal == nil {
+			bnOldVal = new(big.Int)
+		}
 		bnNewVal := bnOldVal.Add(bnOldVal, bnVal)
 		updateKv = append(updateKv, [][]string{{valField, bnNewVal.String()}}...)