Process has died at trackThread

[sptree-m]

Sometimes crash at void YoloROSTracker::trackThread().

When I preview the result image by rqt_image_view and window dragging by mouse, the proccess is died.

If I commented out below, not died.

    for (auto &i : old_result_vec) {
      auto it = std::find_if(result_vec.begin(), result_vec.end(),
                [&i](bbox_t const& b) { return b.track_id == i.track_id && b.obj_id == i.obj_id; });
      bool track_id_absent = (it == result_vec.end());
      if (track_id_absent)
        if (i.frames_counter-- > 1)
            result_vec.push_back(i);
        else it->frames_counter = std::min((unsigned)3, i.frames_counter + 1);
    }

Log

[ INFO] [1562515873.433609549]: Started darknet thread
[ INFO] [1562515873.433782295]: Reference Count > 0
[ INFO] [1562515873.434705322]: Inside tracking
[darknet_ros-1] process has died [pid 17620, exit code -11, cmd /home/nvidia/catkin_ws/devel/lib/darknet_ros/darknet_ros __name:=darknet_ros __log:=/home/nvidia/.ros/log/9f8b6bc4-a0cd-11e9-9537-00044bcbd854/darknet_ros-1.log].
log file: /home/nvidia/.ros/log/9f8b6bc4-a0cd-11e9-9537-00044bcbd854/darknet_ros-1*.log