diff --git a/services/sim.go b/services/sim.go
index 91aa3b2..c9fbdd2 100644
--- a/services/sim.go
+++ b/services/sim.go
@@ -64,9 +64,11 @@ func SimFlowDaySettle() (err error) {
 			//一个月总的收入流量 - 一个月总的支出流量 <= 0
 			sumIncome, _ := dao.GetSimFlowIncomeSum(db, v.IccID, monthBegin, monthEnd)
 			sumExpend, _ := dao.GetSimFlowExpendSum(db, v.IccID, monthBegin, monthEnd)
-			if sumExpend.Flow-sumIncome.Flow <= 0 {
-				v.FlowFlag = 1
-				err = dao.Update(db, v, "flow_flag")
+			if sumIncome != nil && sumExpend != nil {
+				if sumExpend.Flow-sumIncome.Flow <= 0 {
+					v.FlowFlag = 1
+					err = dao.Update(db, v, "flow_flag")
+				}
 			}
 		}
 	}