[Matter.js]How to make the body stop sliding down on slope platform

I would like to create a stair, the player standing on it,but the player is sliding down
For this example
https://labs.phaser.io/edit.html?src=src\physics\matterjs\add%20body%20to%20text.js
How to set the body stop sliding down when the body standing on slope platform??

Is i need to set the Friction???
Thank you very much

Hey, Sorry to say that this is an open bug with matterjs.

Thank you very much :smile:
I will consider hardcode to set when the body collide the slope platform.
the body setStatic (true) or setAllowGravity(false) etc…