Cupboard doors a bove sink

Pictures may help and allow some possible solutions to be suggested. Is it where the hinge is attached to the door, or has the door front failed?

If you are able to to do this at home in the warm, this is how I repair mine!
Remove the complete door at the two hinges, use an epoxy two part adhesive such as araldite, other makes are available, and carefully apply to the wood slots then insert the plastic centre panel, carefully align the pieces and leave them to set. This may take 24hrs depending on the type of epoxy! It may be safer to do one joint at a time! 
As a temporary fix I have used "super glue", but care is needed with alignment and it can need a lot!
Good luck!

Hi , I used clear silicone in situ ,just put a bead along the join and did the non affending one as well as a precaution . Regards       Paul