I think it is because your variable calibration_flags as CALIB_CHECK_COND set.
Try disabling this flag. Without it I was able to undistort your images (see links below).

I am not sure what this check is for (the [documentation][1] is not very explicit). This flag reject some images¹ of my gopro hero 3 even when the chessboard is visible and detected. In my case one image among 20 is not passing this test. This image has the chessboard close to the left border.

https://i.stack.imgur.com/m2WF6.jpg
https://i.stack.imgur.com/KiTRz.jpg
https://i.stack.imgur.com/MhHyN.jpg
https://i.stack.imgur.com/pSiyG.jpg
https://i.stack.imgur.com/drXSL.jpg
https://i.stack.imgur.com/DDze1.jpg
https://i.stack.imgur.com/b6l8f.jpg
https://i.stack.imgur.com/9MrAk.jpg
https://i.stack.imgur.com/WYmg5.jpg
https://i.stack.imgur.com/rmJ5Q.jpg
https://i.stack.imgur.com/K8k8Y.jpg
https://i.stack.imgur.com/MiBER.jpg


¹ in OpenCV versions >= 3.4.1 the [error message][2] tells you which image is not passing the test


  [1]: https://docs.opencv.org/3.4.1/db/d58/group__calib3d__fisheye.html
  [2]: https://github.com/opencv/opencv/pull/9067/commits/5ca7dcc6e74b9c6068b8de1f49f289d6bc6b5a0b