Nan Montano

I got this stack trace on the server, hope it helps

[12:59:02] [Server thread/FATAL]: Error executing task on Server                                                        java.lang.NullPointerException: null                                                                                            at be.b(SourceFile:183) ~[server.jar:?]                                                                                 at bi.a(SourceFile:32) ~[server.jar:?]                                                                                  at bdo.b(SourceFile:478) ~[server.jar:?]                                                                                at biv.a(SourceFile:23) ~[server.jar:?]                                                                                 at bjh.a(SourceFile:212) ~[server.jar:?]                                                                                at yv.a(SourceFile:273) ~[server.jar:?]                                                                                 at zl.a(SourceFile:1000) ~[server.jar:?]                                                                                at sp.a(SourceFile:31) ~[server.jar:?]                                                                                  at sp.a(SourceFile:9) ~[server.jar:?]                                                                                   at nh.a(SourceFile:21) ~[server.jar:?]                                                                                  at uo.run(SourceFile:18) ~[server.jar:?]                                                                                at alu.c(SourceFile:144) [server.jar:?]                                                                                 at aly.c(SourceFile:23) [server.jar:?]                                                                                  at net.minecraft.server.MinecraftServer.b(SourceFile:789) [server.jar:?]                                                at net.minecraft.server.MinecraftServer.c(SourceFile:159) [server.jar:?]                                                at alu.w(SourceFile:118) [server.jar:?]                                                                                 at net.minecraft.server.MinecraftServer.bc(SourceFile:771) [server.jar:?]                                               at net.minecraft.server.MinecraftServer.w(SourceFile:765) [server.jar:?]                                                at alu.c(SourceFile:127) [server.jar:?]                                                                                 at net.minecraft.server.MinecraftServer.v(SourceFile:750) [server.jar:?]                                                at net.minecraft.server.MinecraftServer.run(SourceFile:702) [server.jar:?]                                              at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]