Fatal error with area NaN

[mzur]

[2019-09-20 10:47:15] production.ERROR: Fatal error with laser point detection (code 0).
{
  "command":"/usr/bin/python /var/www/vendor/biigle/laserpoints/src/config/../resources/scripts/delphi_apply.py '/var/www/storage/framework/cache/laserpoints/biigle_delphi_gather_output_5d849144ea6d1' '/var/www/storage/framework/cache/files/806fb3d29e0e31b86cc5a48b1b799ecf8e12132ae9890ce959f19a9e32e631af' '6.4' 2>&1",
  "output":["{\"count\": 3, \"area\": NaN, \"points\": [[2206.5, 1499.0], [2208.0, 1498.0], [2211.0, 1496.0]], \"method\": \"delphi\", \"error\": false}"]
}

It's curious that the code is 0 and error is false and this is still found in the logs. Check how this is possible. Also check how it could find laser points but couldn't compute the area.

[mzur]

I couldn't determine which image this was, only that it came from volume 1835.

[mzur]

The error was thrown (despite code 0) because json_decode returns null if there is a NaN in the JSON. I have no idea how a NaN can happen here. It came from the delphi_alpply.py script, which was executed till the end. @dlangenk any ideas?

Edit: Probably from here since there are 3 laser points.

[mzur]

Maybe this line tried to do sqrt with a negative number?

[dlangenk]

Usually this shouldn't be possible but I'll have a look.

[dlangenk]

The error is indeed that sqrt that is called with a negative number (although it is practically 0).