When some world events like Advancements, deaths, and sometimes even opening inventories, all players online get kicked with the message "Internal Exception: java.lang.NullPointerException" and no other information in Console about why this is happening.
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Thank you for your report!
However, this issue is Invalid.
Your game, launcher and/or server is modified.
If you can reproduce the issue in a vanilla environment, please create a new ticket.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang Studios or the Bugtracker.
Any plugin or resource pack issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run extensively modified server software.
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Please provide the full server console log.