Hi Ivan and welcome to the forum.
A photo would help loads but as said above this may be the end of the boat. You can peel apart seams with solvent and blunt scraper then clean up the old glue but it can be a dreadful job and then you have to wonder if your gluing skills are enough to trust on the water??
Also if you get the solvent anywhere near seams you are not repairing it can cause their glue to degrade after a period.
https://www.ribstore.co.uk/collectio...cleaner-primer