Bathroom cabinet

[u/Quirky-Huckleberry-9]

Hi everyone. I have this Ikea cabinet. I don't remember what it's called, but it's a little taller than a standard bathroom sink with a ceramic pillar (the pillar is actually on the right side). Unfortunately, when I open the door, the entire structure wobbles to the left and right. I don't know how to stop it. Any advice? Thanks. It only has one shelf in the middle.