The bug is if a player goes into the Void, Minecraft crashes. However, this bug(this post) has found to be a duplicate.
Environment
OS: Windows XP, Java: 1.8.0
MC-88788
This bug was fixed. Do not watch.
Resolved
Duplicate
0
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-88357. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.