Couldn't load protochunk error

I have been having issues with my server where it says couldn't load protochunk. It spams the console and crashes the world. 

18.05 00:30:35 [Server] Server thread/INFO Preparing spawn area: 80% 18.05 00:30:35 [Server] WorldGen-Scheduler-1/ERROR Couldn't load protochunk 18.05 00:30:35 [Server] INFO java.lang.IllegalArgumentException: The value 0 is not in the specified inclusive range of 1 to 32 18.05 00:30:35 [Server] INFO at org.apache.commons.lang3.Validate.inclusiveBetween(Validate.java:1032) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at xc.<init>(SourceFile:18) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bnh.a(SourceFile:177) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bnm.a(SourceFile:681) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bnm.b(SourceFile:593) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bnm.b(SourceFile:205) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bnm.b(SourceFile:145) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at tw.a(SourceFile:70) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at tw.a(SourceFile:51) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at java.util.Map.computeIfAbsent(Map.java:957) ~[?:1.8.0_151] 18.05 00:30:35 [Server] INFO at tw.a(SourceFile:50) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at tw.a(SourceFile:25) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at acr$a.a(SourceFile:126) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bmu$1.a(SourceFile:46) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bmu$1.a(SourceFile:27) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at acr$a.a(SourceFile:126) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at java.util.Map.computeIfAbsent(Map.java:957) ~[?:1.8.0_151] 18.05 00:30:35 [Server] INFO at acr$a.a(SourceFile:120) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at acr$a.a(SourceFile:126) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bmu.a(SourceFile:105) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bmu.a(SourceFile:22) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at acr$a.a(SourceFile:126) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at java.util.Map.computeIfAbsent(Map.java:957) ~[?:1.8.0_151] 18.05 00:30:35 [Server] INFO at acr$a.a(SourceFile:120) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at acr$a.a(SourceFile:126) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bmu.a(SourceFile:105) ~[minecraft_server.jar:?] 18.05 00:30:35 [Server] INFO at bmu.a(SourceFile:22) ~[minecraft_server.jar:?] 18.05 00:30:36 [Multicraft] Skipped 2700 lines due to rate limit (30/s) 18.05 00:30:36 [Server] Server thread/INFO Preparing spawn area: 88% 18.05 00:30:36 [Server] WorldGen-Scheduler-1/ERROR Couldn't load protochunk 18.05 00:30:36 [Server] INFO java.lang.IllegalArgumentException: The value 0 is not in the specified inclusive range of 1 to 32 18.05 00:30:36 [Server] INFO at org.apache.commons.lang3.Validate.inclusiveBetween(Validate.java:1032) ~[minecraft_server.jar:?]