diff --git a/AsbCloudApp/Services/ITelemetryDataService.cs b/AsbCloudApp/Services/ITelemetryDataService.cs
index 583da43e..bb40771b 100644
--- a/AsbCloudApp/Services/ITelemetryDataService.cs
+++ b/AsbCloudApp/Services/ITelemetryDataService.cs
@@ -44,7 +44,7 @@ namespace AsbCloudApp.Services
         /// <param name="leDate"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-        Task<DatesRangeDto> GetRangeAsync(int idWell, DateTimeOffset geDate, DateTimeOffset? leDate, CancellationToken token);
+        Task<DatesRangeDto?> GetRangeAsync(int idWell, DateTimeOffset geDate, DateTimeOffset? leDate, CancellationToken token);
 
         /// <summary>
         /// Период за который есть данные по скважине
diff --git a/AsbCloudInfrastructure/Services/SAUB/TelemetryDataBaseService.cs b/AsbCloudInfrastructure/Services/SAUB/TelemetryDataBaseService.cs
index a837ae04..44f730d3 100644
--- a/AsbCloudInfrastructure/Services/SAUB/TelemetryDataBaseService.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/TelemetryDataBaseService.cs
@@ -205,7 +205,7 @@ namespace AsbCloudInfrastructure.Services.SAUB
         }
 
         /// <inheritdoc/>
-        public async Task<DatesRangeDto> GetRangeAsync(int idWell, DateTimeOffset geDate, DateTimeOffset? leDate, CancellationToken token)
+        public async Task<DatesRangeDto?> GetRangeAsync(int idWell, DateTimeOffset geDate, DateTimeOffset? leDate, CancellationToken token)
         {
             var telemetry = telemetryService.GetOrDefaultTelemetryByIdWell(idWell) 
                 ?? throw new ArgumentInvalidException(nameof(idWell), $"По скважине id:{idWell} нет телеметрии");
@@ -242,7 +242,9 @@ namespace AsbCloudInfrastructure.Services.SAUB
                     MaxDate = group.Max(entity => entity.DateTime),
                 });
 
-            var result = await gquery.FirstAsync(token);
+            var result = await gquery.FirstOrDefaultAsync(token);
+            if (result is null)
+                return null;
 
             var range = new DatesRangeDto
             {
diff --git a/AsbCloudWebApi/Controllers/SAUB/TelemetryDataBaseController.cs b/AsbCloudWebApi/Controllers/SAUB/TelemetryDataBaseController.cs
index 21efdcde..a09fd6bf 100644
--- a/AsbCloudWebApi/Controllers/SAUB/TelemetryDataBaseController.cs
+++ b/AsbCloudWebApi/Controllers/SAUB/TelemetryDataBaseController.cs
@@ -136,6 +136,8 @@ namespace AsbCloudWebApi.Controllers.SAUB
         /// <param name="token"></param>
         /// <returns></returns>
         [HttpGet("{idWell}/dateRange")]
+        [ProducesResponseType(typeof(DatesRangeDto), (int)System.Net.HttpStatusCode.OK)]
+        [ProducesResponseType((int)System.Net.HttpStatusCode.NotFound)]
         public virtual async Task<ActionResult<DatesRangeDto?>> GetRangeAsync(
             [FromRoute] int idWell,
             [Required] DateTimeOffset geDate,
@@ -167,7 +169,8 @@ namespace AsbCloudWebApi.Controllers.SAUB
         [HttpGet("{idWell}/datesRange")]
         [Permission]
         [ProducesResponseType(typeof(DatesRangeDto), (int)System.Net.HttpStatusCode.OK)]
-        public virtual async Task<ActionResult<DatesRangeDto>> GetDataDatesRangeAsync(int idWell,
+        [ProducesResponseType((int)System.Net.HttpStatusCode.NotFound)]
+        public virtual async Task<ActionResult<DatesRangeDto?>> GetDataDatesRangeAsync(int idWell,
             CancellationToken token)
         {
             int? idCompany = User.GetCompanyId();