diff --git a/AsbCloudInfrastructure/Services/WellInfoService.cs b/AsbCloudInfrastructure/Services/WellInfoService.cs
index 0632bafc..bbaba879 100644
--- a/AsbCloudInfrastructure/Services/WellInfoService.cs
+++ b/AsbCloudInfrastructure/Services/WellInfoService.cs
@@ -59,6 +59,8 @@ public class WellInfoService
 
             var subsystemStat = await subsystemOperationTimeService
                 .GetStatByActiveWells(wellsIds, token);
+            subsystemStat = subsystemStat.ToArray();
+
             var count = activeWells.Count();
             var i = 0d;
             WellMapInfo = activeWells.Select(well => {