Hi mate
common things to check require the removal of the centre console and rubber gaitor.
1. Check the two springs on top of the gearbox and that the metal plate hasn't broken off between the two springs(if so it will need welding/replacing)
2. Remove the four bolts that hold the lever assembley to the gearbox and the clevis pins for the linkage,then take off the plate and look inside the gearbox.If you look down you will see a round ball with a hole in it for the gearstick to sit in,make sure this is secure and not dropped out.
3. The housing that the ball above fits into is fitted to the selector shaft and secured via a grub screw,check this is tight.
If these all seem o.k it sounds like the gear shaft has snapped,which unfortunately is fairly common for the R380.
Hope this helps and you don't end up needing a replacement gearbox
Neil.....