Jonas Folger to miss 2018 MotoGP season. Subsequently diagnosed with a rare strain of Gilbert Syndrome, a common genetic disorder affecting 2%-5% of the population in which the liver is unable to process toxins effectively, the Monster Yamaha Tech 3 rider reset his focus on recovery ahead of 2018. Sadly, the German has now been forced to announce that he will not be able to race this season – neither physically nor mentally ready to make a return.