diff -Naur nav2-behaviors-1.1.20_orig/src/behavior_server.cpp nav2-behaviors-1.1.20/src/behavior_server.cpp
--- nav2-behaviors-1.1.20_orig/src/behavior_server.cpp	2024-01-01 00:00:00.000000000 +0800
+++ nav2-behaviors-1.1.20/src/behavior_server.cpp	2024-01-01 00:00:00.000000000 +0800
@@ -77,7 +77,7 @@
   transform_listener_ = std::make_shared<tf2_ros::TransformListener>(*tf_);
 
   std::string costmap_topic, footprint_topic, robot_base_frame;
-  double transform_tolerance;
+  double transform_tolerance = 0.0;
   this->get_parameter("costmap_topic", costmap_topic);
   this->get_parameter("footprint_topic", footprint_topic);
   this->get_parameter("transform_tolerance", transform_tolerance);