<?xml version="1.0"?>
<launch>
<arg name="use_sim_time" default="false" />
- <param name="/use_sim_time" value="$(arg use_sim_time)"/>
+ <param name="/use_sim_time" value="$(arg use_sim_time)" if="$(arg use_sim_time)"/>
<node pkg="gmapping" type="slam_gmapping" name="slam_gmapping">
<param name="scan" value="scan" />