diff --git a/nav2_docking/opennav_docking/src/docking_server.cpp b/nav2_docking/opennav_docking/src/docking_server.cpp
index 06f63d1a583..dbb9680c4e8 100644
--- a/nav2_docking/opennav_docking/src/docking_server.cpp
+++ b/nav2_docking/opennav_docking/src/docking_server.cpp
@@ -337,6 +337,7 @@ void DockingServer::dockRobot()
   } catch (opennav_docking_core::DockingException & e) {
     result->error_msg = e.what();
     RCLCPP_ERROR(get_logger(), result->error_msg.c_str());
+    result->error_code = DockRobot::Result::UNKNOWN;
   } catch (std::exception & e) {
     result->error_code = DockRobot::Result::UNKNOWN;
     result->error_msg = e.what();
diff --git a/nav2_docking/opennav_docking/test/test_docking_server.py b/nav2_docking/opennav_docking/test/test_docking_server.py
index 9802b15c176..7f7e10be6c5 100644
--- a/nav2_docking/opennav_docking/test/test_docking_server.py
+++ b/nav2_docking/opennav_docking/test/test_docking_server.py
@@ -136,7 +136,7 @@ def nav_execute_callback(self, goal_handle):
 
         result = NavigateToPose.Result()
         result.error_code = 0
-        result.error_msg = ""
+        result.error_msg = ''
         return result
 
     def test_docking_server(self):