./example_videostab_videostab parameter inconsistent with assertion

[SBCV]

System information (version)

• OpenCV => 4.0.1
• Operating System / Platform => Ubuntu 14.04
• Compiler => gcc

Detailed description

Running ./example_videostab_videostab with default parameters and
-ws=yes
-ws-lp=yes
throws the follwowing error message:
opencv_contrib_4.0.1/modules/videostab/src/global_motion.cpp:554: error: (-215:Assertion failed) motionModel() <= MM_AFFINE && motionModel() != MM_RIGID in function 'estimate'

By default --ws-model is set to homography which violates the first part of the assertion above.
Is the default parameter or the assertion incorrect?

If homography is not allowed , it should be removed from the list of possible parameters.

@alalek can you comment on that? I think you have probably the highest expertise concerning the interface of videostab.