Will this crease be a problem when travelling
It will absolutely not be a problem.
To make you feel better, here's my story. My old passport was in a very terrible state after having spilled some Pepsi from KFC on it. The problem was that I only realised a couple of weeks later when I took it from its drawer and the pages were all wet, sticky and smelly. The biodata page was not damaged, but every single other page had a huge brown stain on it and an unpleasant smell (which fortunately went away after I "cleaned" it and dried it). I still used that passport for a few more years until it expired and I was only asked about the damage once, and after laughing at my story the border agent told be to be more careful.