diff --git a/app/models/runtime/route_mapping_model.rb b/app/models/runtime/route_mapping_model.rb
index 4a33139ab7c..384454b44e9 100644
--- a/app/models/runtime/route_mapping_model.rb
+++ b/app/models/runtime/route_mapping_model.rb
@@ -34,7 +34,6 @@ def protocol_with_defaults
 
     def validate
       validates_presence [:app_port]
-      validates_unique %i[app_guid route_guid process_type app_port]
 
       validate_weight
     end
@@ -60,6 +59,15 @@ def has_app_port_specified?
       app_port != ProcessModel::NO_APP_PORT_SPECIFIED
     end
 
+    def around_save
+      yield
+    rescue Sequel::UniqueConstraintViolation => e
+      raise e unless e.message.include?('route_mappings_app_guid_route_guid_process_type_app_port_key')
+
+      errors.add(%i[app_guid route_guid process_type app_port], :unique)
+      raise validation_failed_error
+    end
+
     private
 
     def logger