diff --git a/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs b/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs
index 392b3f83..2a093f5b 100644
--- a/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs
+++ b/AsbCloudInfrastructure/Services/DailyReport/DailyReportService.cs
@@ -76,19 +76,26 @@ namespace AsbCloudInfrastructure.Services.DailyReport
             if (well is null || well.Timezone is null)
                 throw new ArgumentInvalidException("idWell doesn`t exist", nameof(idWell));
 
+            var startDateOnly = new DateOnly(startDate.Date.Year, startDate.Date.Month, startDate.Date.Day);
+
+            var entity = await db.DailyReports
+                .FirstOrDefaultAsync(r => r.IdWell == idWell && r.StartDate == startDateOnly, token);
+            if (entity is not null)
+                throw new ArgumentInvalidException("daily report already exists", nameof(idWell));
+
             var customer = well.Companies.FirstOrDefault(company => company.IdCompanyType == 1);
             var contractor = well.Companies.FirstOrDefault(company => company.IdCompanyType == 2);
 
-            var entity = new AsbCloudDb.Model.DailyReport.DailyReport
+            entity = new AsbCloudDb.Model.DailyReport.DailyReport
             {
                 IdWell = idWell,
-                StartDate = new DateOnly(startDate.Date.Year, startDate.Date.Month, startDate.Date.Day),
+                StartDate = startDateOnly,
                 Info = new DailyReportInfo() { 
                     Head = new Head()
                     { 
                         ReportDate = startDate.Date,
                         WellName = well.Caption,
-                        ClusterName = well.Cluster,
+                        ClusterName = well?.Cluster ?? String.Empty,
                         Customer = customer?.Caption ?? String.Empty,
                         Contractor = contractor?.Caption ?? String.Empty,
                     }
diff --git a/AsbCloudWebApi/Controllers/DailyReportController.cs b/AsbCloudWebApi/Controllers/DailyReportController.cs
index 1664832e..dde14461 100644
--- a/AsbCloudWebApi/Controllers/DailyReportController.cs
+++ b/AsbCloudWebApi/Controllers/DailyReportController.cs
@@ -1,10 +1,14 @@
 using AsbCloudApp.Data.DailyReport;
+using AsbCloudApp.Exceptions;
 using AsbCloudApp.Services;
+using AsbCloudDb.Model;
+using AsbCloudInfrastructure.Services.Trajectory;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -72,8 +76,17 @@ namespace AsbCloudWebApi.Controllers
         [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
         public async Task<IActionResult> AddAsync(int idWell, [Required] DateTime startDate, CancellationToken token = default)
         {
-            var result = await dailyReportService.AddAsync(idWell, startDate, token);
-            return Ok(result);
+            try
+            {
+                var result = await dailyReportService.AddAsync(idWell, startDate, token);
+                return Ok(result);
+            }
+            catch (ArgumentInvalidException ex)
+            {
+                return BadRequest(ex.Message);
+            }
+
+            
         }