2nd player save file lost

Husband and I play minecraft frequently. Finally made it to the end. Game crashed frequently.  When we telephoned back to the initial teleporter for the end city, the game glitch edie and placed us in a 1 block area that we couldn't escape from. So I killed off my husband so that he would respawn outside. He did, but the game was not spawning blocks in my location. So I saved and quit. Now he can't log back into the game. Instead it gets stuck on The building terrain screen. We have been able to spawn in a third player, but his login is seemingly permanently stuck. Which is totally frustrating because of all the loot and materials he had placed in the ender chests that are now basically gone.