Character falls through baseplate?

I create a sphere around the character, weld it to the center of the torso and make it grow until it's at 10x10x10 in the mesh scale

Once the bubble grows to fullsize, the user sinks into the basepate and falls through it.

1) I've tried setting the density of the bubble to 0, it doesn't work. 2) I've enabled PGSPhysicsSolver but I do not want to rely on this because it restricts other movements I've scripted so I woud have to later disable it.

How would I stop the user falling through the baseplate?