It says that there is one person in a realm although that person isn't actually in the realm and whenever anyone tries to load up that realm it causes Minecraft to crash to the launcher
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Incomplete without a crash report from (minecraft/crash-reports/crash-<DATE>-client.txt). Please attach it to this ticket so that we can diagnose your issue.
You should maybe send the crash report of the launcher into here, before your report gets marked as invalid