diff --git a/planning/planning_debug_tools/scripts/perception_replayer/perception_replayer_common.py b/planning/planning_debug_tools/scripts/perception_replayer/perception_replayer_common.py
index fa0d7301..b8dd59d7 100644
--- a/planning/planning_debug_tools/scripts/perception_replayer/perception_replayer_common.py
+++ b/planning/planning_debug_tools/scripts/perception_replayer/perception_replayer_common.py
@@ -143,20 +143,23 @@ def load_rosbag(self, rosbag2_path: str):
                 self.rosbag_ego_odom_data.append((stamp, msg))
             if topic == traffic_signals_topic:
                 if not isinstance(msg, self.traffic_signals_pub.msg_type):
-                    # convert old TrafficSignalArray msg to new TrafficLightGroupArray msg.
+                    # convert old `TrafficSignalArray` msg to new `TrafficLightGroupArray` msg.
                     new_msg = self.traffic_signals_pub.msg_type()
-                    new_msg.stamp = msg.stamp
+                    assert (
+                        type(msg).__name__ == "TrafficSignalArray"
+                        and type(new_msg).__name__ == "TrafficLightGroupArray"
+                    ), f"Unsupported conversion from {type(msg).__name__} to {type(new_msg).__name__}"
+
+                    new_msg.stamp = msg.header.stamp
                     for traffic_signal in msg.signals:
                         traffic_light_group = TrafficLightGroup()
-                        traffic_light_group.traffic_light_group_id = (
-                            traffic_signal.traffic_signal_id
-                        )
-                        for traffic_signal_element in traffic_signal.elements:
+                        traffic_light_group.traffic_light_group_id = traffic_signal.map_primitive_id
+                        for traffic_light in traffic_signal.lights:
                             traffic_light_element = TrafficLightElement()
-                            traffic_light_element.color = traffic_signal_element.color
-                            traffic_light_element.shape = traffic_signal_element.shape
-                            traffic_light_element.status = traffic_signal_element.status
-                            traffic_light_element.confidence = traffic_signal_element.confidence
+                            traffic_light_element.color = traffic_light.color
+                            traffic_light_element.shape = traffic_light.shape
+                            traffic_light_element.status = traffic_light.status
+                            traffic_light_element.confidence = traffic_light.confidence
                             traffic_light_group.elements.append(traffic_light_element)
                         new_msg.traffic_light_groups.append(traffic_light_group)
                     msg = new_msg
diff --git a/planning/planning_debug_tools/scripts/perception_replayer/perception_reproducer.py b/planning/planning_debug_tools/scripts/perception_replayer/perception_reproducer.py
index da72cc6f..62fa5b39 100755
--- a/planning/planning_debug_tools/scripts/perception_replayer/perception_reproducer.py
+++ b/planning/planning_debug_tools/scripts/perception_replayer/perception_reproducer.py
@@ -221,7 +221,7 @@ def on_timer(self):
             self.ego_odom_id2last_published_timestamp[ego_odom_idx] = timestamp
             self.cool_down_indices.append(ego_odom_idx)
 
-            self.stopwatch.toc("total on_timer")
+        self.stopwatch.toc("total on_timer")
 
     def find_nearest_ego_odom_index(self, ego_pose):
         # nearest search with numpy format is much (~ x100) faster than regular for loop