[Hose inlet popped out]

I got the 1600 psi Ryobi powerwasher...  one day, when I was using it, the entire hose inlet part of the machine popped out the body .

 

I tried pushing it back in... as soon as I put water through the hose, it pops out again.

 

I want to fix it myself and save myself a hassle, but dont want to void warranty if my repair doesnt work out.

 

Anybody know anything about this?

Is it common?  Is it a simple problem or does it imply structural damage somewhere?

 

Thanks.