diff --git a/Bootstrap.Admin/Startup.cs b/Bootstrap.Admin/Startup.cs
index 2ee0d6bf..de5d3eb1 100644
--- a/Bootstrap.Admin/Startup.cs
+++ b/Bootstrap.Admin/Startup.cs
@@ -83,7 +83,7 @@ namespace Bootstrap.Admin
             services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme).AddCookie(options =>
             {
                 options.Cookie.Path = "/";
-                options.Cookie.Domain = Configuration["Domain"];
+                if (!string.IsNullOrEmpty(Configuration["Domain"])) options.Cookie.Domain = Configuration["Domain"];
             });
             services.AddApiVersioning(option =>
             {
diff --git a/Bootstrap.Client/Startup.cs b/Bootstrap.Client/Startup.cs
index 99734319..97c435ac 100644
--- a/Bootstrap.Client/Startup.cs
+++ b/Bootstrap.Client/Startup.cs
@@ -60,7 +60,7 @@ namespace Bootstrap.Client
             services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme).AddCookie(options =>
             {
                 options.Cookie.Path = "/";
-                options.Cookie.Domain = Configuration["Domain"];
+                if (!string.IsNullOrEmpty(Configuration["Domain"])) options.Cookie.Domain = Configuration["Domain"];
                 options.RebuildRedirectUri(Configuration["AuthHost"]);
             });
         }