Dimension BUG in PATCH b51710

After my mod works and launches with 1.14.4 i tried to enter into my dimension and I also used the newest MCreator version (I downloaded it today 16.12.2019) but the game crashed....

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 16.12.19 16:48
Description: Exception in server tick loop

java.util.concurrent.CompletionException: net.minecraft.crash.ReportedException: Exception generating new chunk
    at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) ~[?:1.8.0_222] {}
    at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) ~[?:1.8.0_222] {}
    at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:961) ~[?:1.8.0_222] {}
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926) ~[?:1.8.0_222] {}
    at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442) ~[?:1.8.0_222] {}
    at net.minecraft.world.chunk.ChunkTaskPriorityQueueSorter.lambda$null$1(ChunkTaskPriorityQueueSorter.java:44) ~[?:?] {re:classloading}
    at net.minecraft.util.concurrent.DelegatedTaskExecutor.driveOne(DelegatedTaskExecutor.java:83) ~[?:?] {re:classloading}
    at net.minecraft.util.concurrent.DelegatedTaskExecutor.driveWhile(DelegatedTaskExecutor.java:123) ~[?:?] {re:classloading}
    at net.minecraft.util.concurrent.DelegatedTaskExecutor.run(DelegatedTaskExecutor.java:91) ~[?:?] {re:classloading}
    at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402) ~[?:1.8.0_222] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) ~[?:1.8.0_222] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) ~[?:1.8.0_222] {}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) ~[?:1.8.0_222] {}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) ~[?:1.8.0_222] {}
Caused by: net.minecraft.crash.ReportedException: Exception generating new chunk
    at net.minecraft.world.server.ChunkManager.lambda$null$17(ChunkManager.java:523) ~[?:?] {re:classloading}
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[datafixerupper-2.0.24.jar:?] {}
    at net.minecraft.world.server.ChunkManager.lambda$func_223156_b$19(ChunkManager.java:510) ~[?:?] {re:classloading}
    at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952) ~[?:1.8.0_222] {}
    ... 11 more
Caused by: java.lang.NullPointerException
    at net.mcreator.lukes_star_wars_galaxies_mod.MCreatorTatooine$BiomeProviderCustom.lambda$hasStructure$1(MCreatorTatooine.java:309) ~[?:?] {re:classloading}
    at java.util.HashMap.computeIfAbsent(HashMap.java:1127) ~[?:1.8.0_222] {}
    at net.mcreator.lukes_star_wars_galaxies_mod.MCreatorTatooine$BiomeProviderCustom.hasStructure(MCreatorTatooine.java:307) ~[?:?] {re:classloading}
    at net.minecraft.world.gen.ChunkGenerator.initStructureStarts(ChunkGenerator.java:155) ~[?:?] {re:classloading}
    at net.minecraft.world.chunk.ChunkStatus.lambda$static$2(ChunkStatus.java:41) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.world.chunk.ChunkStatus.func_223198_a(ChunkStatus.java:196) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.world.server.ChunkManager.lambda$null$17(ChunkManager.java:512) ~[?:?] {re:classloading}
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[datafixerupper-2.0.24.jar:?] {}
    at net.minecraft.world.server.ChunkManager.lambda$func_223156_b$19(ChunkManager.java:510) ~[?:?] {re:classloading}
    at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952) ~[?:1.8.0_222] {}
    ... 11 more

A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
    Minecraft Version: 1.14.4
    Minecraft Version ID: 1.14.4
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_222, BellSoft
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), 
    Memory: 422289616 bytes (402 MB) / 2116550656 bytes (2018 MB) up to 3808428032 bytes (3632 MB)
    CPUs: 12
    JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
    ModLauncher: 4.1.0+62+5bfa59b
    ModLauncher launch target: fmluserdevclient
    ModLauncher naming: mcp
    ModLauncher services: 
        /eventbus-1.0.0-service.jar eventbus PLUGINSERVICE 
        /forge-1.14.4-28.1.106_mapped_snapshot_20190719-1.14.3-launcher.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.14.4-28.1.106_mapped_snapshot_20190719-1.14.3-launcher.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-1.0.1-milestone.0.1+94458e7-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.14.4-28.1.106_mapped_snapshot_20190719-1.14.3-launcher.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.14.4-28.1.106_mapped_snapshot_20190719-1.14.3-launcher.jar runtimedistcleaner PLUGINSERVICE 
        /forge-1.14.4-28.1.106_mapped_snapshot_20190719-1.14.3-launcher.jar fml TRANSFORMATIONSERVICE 
    FML: 28.1
    Forge: net.minecraftforge:28.1.106
    FML Language Providers: 
        javafml@28.1
        minecraft@1
    Mod List: 
        client-extra.jar Minecraft {minecraft@1.14.4 DONE}
        main Luke's Star Wars Galaxies Mod {lukes_star_wars_galaxies_mod@2.0.0 DONE}
        forge-1.14.4-28.1.106_mapped_snapshot_20190719-1.14.3-recomp.jar Forge {forge@28.1.106 DONE}
    Player Count: 1 / 8; [ServerPlayerEntity['Dev'/275, l='New World', x=128.00, y=75.00, z=224.00]]
    Data Packs: vanilla, mod:forge, mod:lukes_star_wars_galaxies_mod
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'forge'