Nether Portal Bug

I was playing in my minecraft world and while entering the Nether portal to go back to my base a mob killed me in the portal and in the nether portals the interfaces cant be use and that happened in there so when I join the world it just stays there making the animation of the portal leaving me no option that go to the tasks bar and close the game there. I had a lot of progress on that world and I don't want to start over again.