Is there a way of fixing?

Have you tightened the bolts on the neck to body?

 

If the screws are tight there is no way it should wobble... Take screw driver and see if you can give it an 1/8th turn at a time... If the screws are already seated into the neck plate a 1/4 turn should do it. If it still wobbles you may need to take off the neck and fill the wood and then screw the screws back in. Tighten the screws in an X pattern right top left bottom, left top right bottom.

 

In my experience, if there's a gap in the pocket, the neck can move. So, most fenders can have this problem. Tightening the bolts helps, but it can still move.

I watched a Billy Sheehan video once and got some tips here. I've put a fender bass face down with the neck joint on a phone book, stood on the bass (one foot on either side of the neck plate, and tightened the neck bolts as tight as I could. I've also jammed razor bladed in the gap in the neck pocket so the neck can't move.

I don't recommend doing this, because you could damage your bass. But I've done it on a couple basses and it solved this problem.

 

Instead of doing that, get a good wooden clamp or a large clamp with rubber over the metal ends. Take off your strings, take out your bolts, make sure the neck is all the way in the pocket and clamp it. Put your bolts back in and tighten in a criss-cross patern a little at a time until its tight.