Crashing When Nether Opens

We do not have enough information to find the cause of this issue.

Please attach the crash report found in [minecraft/crash-reports/crash-<DATE>-client.txt|https://minecrafthopper.net/help/guides/finding-minecraft-data-folder/] here.
If you cannot find a crash report, please attach the full launcher log found in [minecraft/launcher_log.txt|https://minecrafthopper.net/help/guides/getting-minecraft-logs/].

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Was the world created in Pre-release 1? If so then this MC-187408

I made my own local server, I wanted to enter the nether and the server went off with crashes.

@unknown, your issue is caused by general server lag.

OP, please attach your crash report.