So kind a played on server with friends, (about 10-20min.) and I've got error in server console:
20:10:41 ERROR]: Failed to save chunk
java.io.UTFDataFormatException: encoded string too long: 131070 bytes
at java.io.DataOutputStream.writeUTF(Unknown Source) ~[?:1.8.0_45]
at java.io.DataOutputStream.writeUTF(Unknown Source) ~[?:1.8.0_45]
at ea.a(SourceFile:29) ~[minecraft_server.15w31a%20(1).jar:?]
at dn.a(SourceFile:407) ~[minecraft_server.15w31a%20(1).jar:?]
at dn.a(SourceFile:54) ~[minecraft_server.15w31a%20(1).jar:?]
at du.a(SourceFile:45) ~[minecraft_server.15w31a%20(1).jar:?]
at dn.a(SourceFile:407) ~[minecraft_server.15w31a%20(1).jar:?]
at dn.a(SourceFile:54) ~[minecraft_server.15w31a%20(1).jar:?]
at dn.a(SourceFile:407) ~[minecraft_server.15w31a%20(1).jar:?]
at dn.a(SourceFile:54) ~[minecraft_server.15w31a%20(1).jar:?]
at dx.a(SourceFile:91) ~[minecraft_server.15w31a%20(1).jar:?]
at dx.a(SourceFile:79) ~[minecraft_server.15w31a%20(1).jar:?]
at aov.b(SourceFile:139) ~[minecraft_server.15w31a%20(1).jar:?]
at aov.c(SourceFile:124) [minecraft_server.15w31a%20(1).jar:?]
at awb.c(SourceFile:37) [minecraft_server.15w31a%20(1).jar:?]
at awb.run(SourceFile:30) [minecraft_server.15w31a%20(1).jar:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]

When we try to rejoin server (after error we've got this error in game)
Internal Exception io.netty.handler.codec.DecoderException:com.google.gson.JsonSyntaxException:com.google.gson.steam.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 2.