leak in my roof/ right window.
 

hey guys!

i am new to my car i got a volkswagen golf cabrio 3 from 1996. i got a small leak at the right side of my car. my roof is still in a really good condition. and my roof is also closing well to my car. but at my window there is a small leak. it is close to my closing handle. we checked the rubber but we dont see anything strange. is there any one who had this problem aswell? or are there any suggestions?

thanks a lot!