When loading chunks server randomly crash - Error:

Caused by: java.lang.NullPointerException
at net.minecraft.server.v1_14_R1.WorldGenStronghold.a(SourceFile:46) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ChunkGenerator.createStructures(ChunkGenerator.java:151) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ChunkStatus.d(SourceFile:52) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ChunkStatus.a(SourceFile:217) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PlayerChunkMap.lambda$25(PlayerChunkMap.java:514) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PlayerChunkMap.lambda$23(PlayerChunkMap.java:512) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952) ~[?:1.8.0_191]
at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926) ~[?:1.8.0_191]
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442) ~[?:1.8.0_191]
at net.minecraft.server.v1_14_R1.ChunkTaskQueueSorter.b(SourceFile:58) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ThreadedMailbox.e(SourceFile:83) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ThreadedMailbox.a(SourceFile:123) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ThreadedMailbox.run(SourceFile:91) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) ~[?:1.8.0_191]
[19:13:05] [Server thread/ERROR]: Cause of unexpected exception was
java.lang.NullPointerException: null
at net.minecraft.server.v1_14_R1.WorldGenStronghold.a(SourceFile:46) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ChunkGenerator.createStructures(ChunkGenerator.java:151) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ChunkStatus.d(SourceFile:52) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ChunkStatus.a(SourceFile:217) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PlayerChunkMap.lambda$25(PlayerChunkMap.java:514) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.PlayerChunkMap.lambda$23(PlayerChunkMap.java:512) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952) ~[?:1.8.0_191]
at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926) ~[?:1.8.0_191]
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442) ~[?:1.8.0_191]
at net.minecraft.server.v1_14_R1.ChunkTaskQueueSorter.b(SourceFile:58) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ThreadedMailbox.e(SourceFile:83) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ThreadedMailbox.a(SourceFile:123) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at net.minecraft.server.v1_14_R1.ThreadedMailbox.run(SourceFile:91) ~[minecraft_server.jar:git-Spigot-9de398a-9c887d4]
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) ~[?:1.8.0_191]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) ~[?:1.8.0_191]