Exception generating new chunk

Details:
Minecraft Version: 18w08b
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 407589944 bytes (388 MB) / 671088640 bytes (640 MB) up to 1073741824 bytes (1024 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [rz['titangamer1216'/364, l='Aquarium Attempt 1', x=-121.32, y=69.17, z=229.92]]
Data Packs: vanilla
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
#@

Crash report saved to: #@!@# C:\Users\randall\AppData\Roaming\.minecraft\crash-reports\crash-2018-02-24_19.33.32-server.txt
<log4j:Event logger="net.minecraft.server.MinecraftServer" timestamp="1519522412217" level="INFO" thread="Server thread">
<log4j:Message><![CDATA[Saving worlds]]></log4j:Message>
</log4j:Event>