temporary fix bug null pointer

Author: 随风而散

nav2_costmap_2d/src/costmap_layer.cpp

@@ -56,6 +56,12 @@ void CostmapLayer::touch(
 void CostmapLayer::matchSize()
 {
   Costmap2D * master = layered_costmap_->getCostmap();
+  if (!master) {
+      RCLCPP_WARN(
+        rclcpp::get_logger("nav2_costmap_2d"),
+        "Cannot match size for layer, master costmap is not initialized yet.");
+      return;
+    }
   resizeMap(
     master->getSizeInCellsX(), master->getSizeInCellsY(), master->getResolution(),
     master->getOriginX(), master->getOriginY());

nav2_costmap_2d/src/layered_costmap.cpp

@@ -96,7 +96,9 @@ void LayeredCostmap::resizeMap(
   for (vector<std::shared_ptr<Layer>>::iterator plugin = plugins_.begin();
     plugin != plugins_.end(); ++plugin)
   {
-    (*plugin)->matchSize();
+    if (*plugin) {
+      (*plugin)->matchSize();
+    }
   }
 }