Help on friction setting player on fire (Speedster)

Hi, so I'm making a custom superhero mod and decided to add Speedsters in (being one of the most famous superpowers). It was working pretty ok, if you pressed a button your speed increased and etc, but then I decided to add some "realism", so if you were running without a friction proof supersuit (which I was already moddeling in Blockbench) you would catch on fire. I don't know what I did wrong and I found no tutorial out there to help me.

 I don't know how to add images, but if necessary I could try to replicate the code here.