diff -Naur ros-humble-nav2-planner-1.1.9_org/src/planner_server.cpp ros-humble-nav2-planner-1.1.9/src/planner_server.cpp
--- ros-humble-nav2-planner-1.1.9_org/src/planner_server.cpp	2023-09-11 16:38:07.337876022 +0800
+++ ros-humble-nav2-planner-1.1.9/src/planner_server.cpp	2023-09-11 16:38:25.934148439 +0800
@@ -118,7 +118,7 @@
     get_logger(),
     "Planner Server has %s planners available.", planner_ids_concat_.c_str());
 
-  double expected_planner_frequency;
+  double expected_planner_frequency = 0.0;
   get_parameter("expected_planner_frequency", expected_planner_frequency);
   if (expected_planner_frequency > 0) {
     max_planner_duration_ = 1 / expected_planner_frequency;