I was in the middle of doing this quest when a settlement needed my help. I ran to their aid and when I came back to try and talk to Travis (I already helped him get Vadim out of Beantown Brewery and killed everyone there), he's nowhere to be found. There's a marker on the map saying he is somewhere close to the Mass Pike Interchange but when I go to the marker he's not there. Also, the map shows the marker around the Mass Pike Interchange but if you follow the marker on your screen it takes you back to Diamond City. I've been looking for a bug fix but I find nothing. Please help!