java.lang.RuntimeException: Failed to check session lock, aborting

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java.lang.RuntimeException: Failed to check session lock, aborting
at undefined.e.e(SourceFile:52)
at undefined.e.(SourceFile:38)
at undefined.ar.(SourceFile:18)
at undefined.adg.a(SourceFile:77)
at undefined.xz.e(SourceFile:161)
at undefined.xz.a(SourceFile:119)
at undefined.xe.a(xe.java:58)
at undefined.xe.h(xe.java:106)
at undefined.xe.g(xe.java:91)
at net.minecraft.client.Minecraft.k(SourceFile:1362)
at net.minecraft.client.Minecraft.x(SourceFile:705)
at java.lang.Thread.run(Unknown Source)

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