diff --git a/NewPlatform.Flexberry.ORM.ODataService/Controllers/DataObjectController.cs b/NewPlatform.Flexberry.ORM.ODataService/Controllers/DataObjectController.cs
index 6da1eabe..373b6113 100644
--- a/NewPlatform.Flexberry.ORM.ODataService/Controllers/DataObjectController.cs
+++ b/NewPlatform.Flexberry.ORM.ODataService/Controllers/DataObjectController.cs
@@ -417,7 +417,7 @@ public OkObjectResult GetString()
 #if NETFRAMEWORK
         public HttpResponseMessage GetGuid()
 #elif NETSTANDARD
-        public OkObjectResult GetGuid()
+        public ActionResult GetGuid()
 #endif
         {
             try
@@ -430,8 +430,18 @@ public OkObjectResult GetGuid()
 
                 var edmObj = GetEdmObject(_model.GetEdmEntityType(type), obj, 1, null, _dynamicView);
 #if NETFRAMEWORK
+                if (obj == null)
+                {
+                    return Request.CreateResponse(HttpStatusCode.NotFound);
+                }
+
                 return Request.CreateResponse(HttpStatusCode.OK, edmObj);
 #elif NETSTANDARD
+                if (obj == null)
+                {
+                    return NotFound(edmObj);
+                }
+
                 return Ok(edmObj);
 #endif
             }
diff --git a/Tests/NewPlatform.Flexberry.ORM.ODataService.Tests/CRUD/Read/GetByIdTest.cs b/Tests/NewPlatform.Flexberry.ORM.ODataService.Tests/CRUD/Read/GetByIdTest.cs
new file mode 100644
index 00000000..560ead0c
--- /dev/null
+++ b/Tests/NewPlatform.Flexberry.ORM.ODataService.Tests/CRUD/Read/GetByIdTest.cs
@@ -0,0 +1,45 @@
+namespace NewPlatform.Flexberry.ORM.ODataService.Tests.CRUD.Read
+{
+    using System;
+    using System.Net;
+    using System.Net.Http;
+
+    using ICSSoft.STORMNET;
+
+    using Xunit;
+
+    /// <summary>
+    /// Unit-test class for reading a non-existent data through OData service.
+    /// </summary>
+    public class GetByIdTest : BaseODataServiceIntegratedTest
+    {
+#if NETCOREAPP
+        /// <summary>
+        /// Конструктор по-умолчанию.
+        /// </summary>
+        /// <param name="factory">Фабрика для приложения.</param>
+        /// <param name="output">Вывод отладочной информации.</param>
+        public GetByIdTest(CustomWebApplicationFactory<ODataServiceSample.AspNetCore.Startup> factory, Xunit.Abstractions.ITestOutputHelper output)
+            : base(factory, output)
+        {
+        }
+#endif
+
+        /// <summary>
+        /// Tests that a request with a non-existent key returns a 404 error.
+        /// </summary>
+        [Fact]
+        public void TestGetById()
+        {
+            ActODataService(args =>
+            {
+                string requestUrl = string.Format("http://localhost/odata/{0}({1})", args.Token.Model.GetEdmEntitySet(typeof(Страна)).Name, "8dcd3aa3-11c2-456d-902c-03323e1ae635");
+
+                using (HttpResponseMessage response = args.HttpClient.GetAsync(requestUrl).Result)
+                {
+                    Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
+                }
+            });
+        }
+    }
+}