In the 17w17b snapshot, there is an odd bug where every few minutes, (5-10), my world crashes, due to "java.lang.IllegalStateException: Unable to get Y-rotated facing of up." This did not occur in the previous snapshot, and it seems to only affect this.

The error follows:
----------
[16:23:01] [Server thread/ERROR]: Encountered an unexpected exception
f: Exception ticking world
at net.minecraft.server.MinecraftServer.D(SourceFile:630) ~[minecraft_server.17w17b.jar:?]
at ne.D(SourceFile:335) ~[minecraft_server.17w17b.jar:?]
at net.minecraft.server.MinecraftServer.C(SourceFile:562) ~[minecraft_server.17w17b.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:466) [minecraft_server.17w17b.jar:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_111]
Caused by: java.lang.IllegalStateException: Unable to get Y-rotated facing of up
at el.e(SourceFile:136) ~[minecraft_server.17w17b.jar:?]
at apq.a(SourceFile:184) ~[minecraft_server.17w17b.jar:?]
at avv$a.d(SourceFile:428) ~[minecraft_server.17w17b.jar:?]
at asx.a(SourceFile:123) ~[minecraft_server.17w17b.jar:?]
at alv.f(SourceFile:2079) ~[minecraft_server.17w17b.jar:?]
at nt.j(SourceFile:411) ~[minecraft_server.17w17b.jar:?]
at nt.d(SourceFile:220) ~[minecraft_server.17w17b.jar:?]
at net.minecraft.server.MinecraftServer.D(SourceFile:626) ~[minecraft_server.17w17b.jar:?]
... 4 more
[16:23:01] [Server thread/ERROR]: This crash report has been saved to: /home/root/multicraft/servers/server590907/./crash-reports/crash-2017-04-27_16.23.01-server.txt
[16:23:01] [Server thread/INFO]: Stopping server
[16:23:01] [Server thread/INFO]: Saving players