turtlebot3 exploration goal initializing problem

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Hi, I'm new on ros and I was trying to make explore package using explore_lite(http://wiki.ros.org/expl.... I modified the way of finding goal and simulated on turtlebot world. Navigation was worked but while moving, debug messages shown below poped in terminal and goal was initialized. When goal is gone, it need time to search other goal but turtlebot still move forward so it bumped to obstacle. Can someone please tell me why this is happening and how can I get my goal without initializing? I found that debug messages are from actionlib.

`[DEBUG] [1626236548.989242062, 33.181000000]: IN DELETER