diff --git a/DOAN.Service/MES/base/BaseWorkRouteService.cs b/DOAN.Service/MES/base/BaseWorkRouteService.cs
index ad3acb0..22968af 100644
--- a/DOAN.Service/MES/base/BaseWorkRouteService.cs
+++ b/DOAN.Service/MES/base/BaseWorkRouteService.cs
@@ -151,24 +151,24 @@ namespace DOAN.Service.Business
 
             }
             BaseRelWorkRouteProcesses firstnode = new BaseRelWorkRouteProcesses();
-            firstnode.FkWorkProcesses = baseParse.nodes.Where(it => it.id == first_node_id).Select(it => it.properties.processesId).First();
+            firstnode.FkWorkProcesses = baseParse.nodes.Where(it => it.id == first_node_id).Select(it => it.properties.processesId).FirstOrDefault();
             firstnode.Sort = 0;
             firstnode.FkWorkRoute = baseParseNodeDto.RouteID;
             firstnode.CreatedTime = DateTime.Now;
             need_insert_node.Add(firstnode);
             //----------------------------------------
-            // 写一个函数 输入 一个节点 返回下面的节点
+           
             string levels = first_node_id;
             int index3 = 0;
             while (true)
             {
                 index3++;
-                string next_id = baseParse.edges.Where(it => it.sourceNodeId == levels).Select(it => it.targetNodeId).First();
+                string next_id = baseParse.edges.Where(it => it.sourceNodeId == levels).Select(it => it.targetNodeId).FirstOrDefault();
                 if (!string.IsNullOrEmpty(next_id))
                 {
                     levels = next_id;
                     BaseRelWorkRouteProcesses nextnode = new BaseRelWorkRouteProcesses();
-                    nextnode.FkWorkProcesses = baseParse.nodes.Where(it => it.id == levels).Select(it => it.properties.processesId).First(); ;
+                    nextnode.FkWorkProcesses = baseParse.nodes.Where(it => it.id == levels).Select(it => it.properties.processesId).FirstOrDefault(); ;
                     nextnode.Sort = index3;
                     firstnode.FkWorkRoute = baseParseNodeDto.RouteID;
                     firstnode.CreatedTime = DateTime.Now;