If I enter my world and I try to look around my game crash

Please help me because it´s for my an importent world/map. (I have a backup if there is a world problem) 

There are some villager , maybe it help 

CRASH-REPORT:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Sorry
Time: 20.03.19 20:27Description: Ticking block entity
java.lang.NullPointerException: Ticking block entity at ev.<init>(SourceFile:52) at bso.i(SourceFile:194) at bso.g(SourceFile:104) at bgf.K(SourceFile:620) at vd.a(SourceFile:401) at net.minecraft.server.MinecraftServer.b(SourceFile:816) at net.minecraft.server.MinecraftServer.a(SourceFile:755) at dwc.a(SourceFile:128) at net.minecraft.server.MinecraftServer.run(SourceFile:630) at java.lang.Thread.run(Thread.java:745)A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at ev.<init>(SourceFile:52) at bso.i(SourceFile:194) at bso.g(SourceFile:104)
– Block entity being ticked --Details: Name: minecraft:conduit // bso Block: Block{minecraft:conduit}[waterlogged=true] Block location: World: (377,49,0), Chunk: (at 9,3,0 in 23,0; contains blocks 368,0,0 to 383,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511) Block: Block{minecraft:conduit}[waterlogged=true] Block location: World: (377,49,0), Chunk: (at 9,3,0 in 23,0; contains blocks 368,0,0 to 383,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)Stacktrace: at bgf.K(SourceFile:620) at vd.a(SourceFile:401)
– Affected level --Details: Level name: Rennbahn_world All players: 1 total; [ve['Luki2811'/311, l='Rennbahn_world', x=183.74, y=66.00, z=-621.88]] Chunk stats: ServerChunkCache: 3551 Level seed: -4243041689548168308 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: {} Level spawn location: World: (349,66,-167), Chunk: (at 13,4,9 in 21,-11; contains blocks 336,0,-176 to 351,255,-161), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1) Level time: 53458240 game time, 326373 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: trueStacktrace: at net.minecraft.server.MinecraftServer.b(SourceFile:816) at net.minecraft.server.MinecraftServer.a(SourceFile:755) at dwc.a(SourceFile:128) at net.minecraft.server.MinecraftServer.run(SourceFile:630) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 19w12a Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 777629920 bytes (741 MB) / 2080374784 bytes (1984 MB) up to 2147483648 bytes (2048 MB) JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M Player Count: 1 / 8; [ve['Luki2811'/311, l='Rennbahn_world', x=183.74, y=66.00, z=-621.88]] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.