Kinect as LaserRangeFinder generates too few points [closed]

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Hi,

I'm using a Turtlebot 2 equipped with a Kinect and want to use the Nav2D package for autonomous exploration. I have the Nav2D tutorials all running and after changing the publication of the kinect to laser scanner from 'scan' to 'base_scan' topic, all the data gets to all the nodes it should be.

But I do have a problem, as the mapper is complaining, that the laser range finder generates to few points:

[ERROR] [139658429.960665722]: LaserRangeFinder::Validate() - LocalizedRangeScan contains 640 range readings, expected 641

What am I doing wrong?