diff --git a/src/ReC.API/Middleware/ExceptionHandlingMiddleware.cs b/src/ReC.API/Middleware/ExceptionHandlingMiddleware.cs
index dc02a81..0486ea6 100644
--- a/src/ReC.API/Middleware/ExceptionHandlingMiddleware.cs
+++ b/src/ReC.API/Middleware/ExceptionHandlingMiddleware.cs
@@ -1,4 +1,5 @@
 using DigitalData.Core.Exceptions;
+using ReC.Application.Common.Exceptions;
 using System.Net;
 using System.Text.Json;
 
@@ -69,6 +70,11 @@ public class ExceptionHandlingMiddleware
                 message = notFoundEx.Message;
                 break;
 
+            case DataIntegrityException dataIntegrityEx:
+                context.Response.StatusCode = (int)HttpStatusCode.Conflict;
+                message = dataIntegrityEx.Message;
+                break;
+
             default:
                 logger.LogError(exception, "Unhandled exception occurred.");
                 context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;