diff --git a/framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/MultiTenantConnectionStringResolver.cs b/framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/MultiTenantConnectionStringResolver.cs
index 41ba7873ac..631646eaca 100644
--- a/framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/MultiTenantConnectionStringResolver.cs
+++ b/framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/MultiTenantConnectionStringResolver.cs
@@ -41,7 +41,7 @@ namespace Volo.Abp.MultiTenancy
             }
 
             var tenantDefaultConnectionString = tenant.ConnectionStrings.Default;
-            
+
             //Requesting default connection string...
             if (connectionStringName == null ||
                 connectionStringName == ConnectionStrings.DefaultConnectionStringName)
@@ -59,10 +59,10 @@ namespace Volo.Abp.MultiTenancy
                 //Found for the tenant
                 return connString;
             }
-            
+
             //Fallback to the mapped database for the specific connection string
             var database = Options.Databases.GetMappedDatabaseOrNull(connectionStringName);
-            if (database != null)
+            if (database != null && database.IsUsedByTenants)
             {
                 connString = tenant.ConnectionStrings.GetOrDefault(database.DatabaseName);
                 if (!connString.IsNullOrWhiteSpace())
@@ -166,4 +166,4 @@ namespace Volo.Abp.MultiTenancy
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/framework/test/Volo.Abp.MultiTenancy.Tests/Volo/Abp/Data/MultiTenancy/MultiTenantConnectionStringResolver_Tests.cs b/framework/test/Volo.Abp.MultiTenancy.Tests/Volo/Abp/Data/MultiTenancy/MultiTenantConnectionStringResolver_Tests.cs
index f6af2bde72..57f13cd057 100644
--- a/framework/test/Volo.Abp.MultiTenancy.Tests/Volo/Abp/Data/MultiTenancy/MultiTenantConnectionStringResolver_Tests.cs
+++ b/framework/test/Volo.Abp.MultiTenancy.Tests/Volo/Abp/Data/MultiTenancy/MultiTenantConnectionStringResolver_Tests.cs
@@ -30,6 +30,21 @@ namespace Volo.Abp.Data.MultiTenancy
             {
                 options.ConnectionStrings.Default = "default-value";
                 options.ConnectionStrings["db1"] = "db1-default-value";
+                options.ConnectionStrings["Saas"] = "Saas-default-value";
+                options.ConnectionStrings["Admin"] = "Admin-default-value";
+
+                options.Databases.Configure("Saas", database =>
+                {
+                    database.MappedConnections.Add("Saas1");
+                    database.MappedConnections.Add("Saas2");
+                    database.IsUsedByTenants = false;
+                });
+
+                options.Databases.Configure("Admin", database =>
+                {
+                    database.MappedConnections.Add("Admin1");
+                    database.MappedConnections.Add("Admin2");
+                });
             });
 
             services.Configure<AbpDefaultTenantStoreOptions>(options =>
@@ -41,7 +56,8 @@ namespace Volo.Abp.Data.MultiTenancy
                         ConnectionStrings =
                         {
                             { ConnectionStrings.DefaultConnectionStringName, "tenant1-default-value"},
-                            {"db1", "tenant1-db1-value"}
+                            {"db1", "tenant1-db1-value"},
+                            {"Admin", "tenant1-Admin-value"}
 }
                     },
                     new TenantConfiguration(_tenant2Id, "tenant2")
@@ -55,12 +71,16 @@ namespace Volo.Abp.Data.MultiTenancy
             //No tenant in current context
             (await _connectionResolver.ResolveAsync()).ShouldBe("default-value");
             (await _connectionResolver.ResolveAsync("db1")).ShouldBe("db1-default-value");
+            (await _connectionResolver.ResolveAsync("Saas1")).ShouldBe("Saas-default-value");
+            (await _connectionResolver.ResolveAsync("Admin2")).ShouldBe("Admin-default-value");
 
             //Overriden connection strings for tenant1
             using (_currentTenant.Change(_tenant1Id))
             {
                 (await _connectionResolver.ResolveAsync()).ShouldBe("tenant1-default-value");
                 (await _connectionResolver.ResolveAsync("db1")).ShouldBe("tenant1-db1-value");
+                (await _connectionResolver.ResolveAsync("Saas1")).ShouldBe("tenant1-default-value");
+                (await _connectionResolver.ResolveAsync("Admin2")).ShouldBe("tenant1-Admin-value");
             }
 
             //No tenant in current context
@@ -72,6 +92,8 @@ namespace Volo.Abp.Data.MultiTenancy
             {
                 (await _connectionResolver.ResolveAsync()).ShouldBe("default-value");
                 (await _connectionResolver.ResolveAsync("db1")).ShouldBe("db1-default-value");
+                (await _connectionResolver.ResolveAsync("Saas1")).ShouldBe("Saas-default-value");
+                (await _connectionResolver.ResolveAsync("Admin2")).ShouldBe("Admin-default-value");
             }
         }
     }