MeshCollider cookConvexMesh: user-provided convex mesh descriptor is invalid!

I have a MeshFilter attached to a RigidBody with a MeshCollider, and I declare:

Mesh mesh = myObject.GetComponent< MeshFilter>().mesh;
MeshCollider meshCollider = myObject.GetComponent< MeshCollider>();

I update the mesh vertices (from an array called "vertices") and attempt to update the MeshCollider accordingly:

meshCollider.sharedMesh = null;
mesh.vertices = vertices;
meshCollider.sharedMesh = mesh;

When running the game I get the following error upon creation of myObject:

Cooking::cookConvexMesh: user-provided convex mesh descriptor is invalid! UnityEngine.MeshCollider:set_sharedMesh(Mesh)

I've noticed that when I remove the line that turns the sharedMesh into null the error is gone but the MeshCollider won't update.

Did anyone run into such an error? If so, what am I doing wrong?

Thanks.