Blank C menu window stays on screen after faceposing

A lot of the time when I’m using the context menu for faceposing, the window will stay in the bottom-right part of the screen, except there won’t be anything inside it. When this happens, I can’t do anything, like open the Q menu or switch to other weapons, so I don’t have any choice but to restart GMod. Is there any way to stop this from happening, besides not using the C menu?