When trying to enter the Nexus area while riding on a sparrow, the entrance that is meant to block sparrows from entering, PC unexpectedly shut down. Was able to reproduce twice back to back attempts. Class was Titan, sparrow was Firecrest. Not sure if there is an official bug reporting system that Bungie has. Hopefully this information will help out somehow with other people that can potentially be experiencing this problem too. For now the solution was to not try to get into the area with a sparrow.