Crash on load: Ticking memory connection

Trying to load an old world from 1.8.  I've tried the "optimize world" option (which seems to have worked), but when attempting to load the world it crashes around 96%.

-I've tried restarting of course

-Uninstalling and reinstalling

-Uninstalling Java and reinstalling

-I am able to successfully reload other 1.8 saves I have, just not this one for some reason.

-It was at one point a Realms save if that makes a difference.

Minecraft Crash Report -------- Minecraft Crash Report ----// I let you down. Sorry 😞
Time: 8/17/18 2:08 PMDescription: Ticking memory connection
i: Non [a-z0-9/._-] character in path of location: minecraft:EntityHorse at pc.<init>(SourceFile:38) at pc.<init>(SourceFile:43) at wn.a(SourceFile:121) at wn.a(SourceFile:100) at wn.<init>(SourceFile:48) at vo.a(SourceFile:915) at te.<init>(SourceFile:159) at vo.g(SourceFile:442) at ud.b(SourceFile:113) at ud.Y_(SourceFile:65) at hw.a(SourceFile:238) at ua.c(SourceFile:171) at net.minecraft.server.MinecraftServer.w(SourceFile:749) at net.minecraft.server.MinecraftServer.v(SourceFile:656) at dfx.v(SourceFile:157) at net.minecraft.server.MinecraftServer.run(SourceFile:559) 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 pc.<init>(SourceFile:38) at pc.<init>(SourceFile:43) at wn.a(SourceFile:121) at wn.a(SourceFile:100) at wn.<init>(SourceFile:48) at vo.a(SourceFile:915) at te.<init>(SourceFile:159) at vo.g(SourceFile:442) at ud.b(SourceFile:113) at ud.Y_(SourceFile:65) at hw.a(SourceFile:238)
– Ticking connection --Details: Connection: hw@dbd170fStacktrace: at ua.c(SourceFile:171) at net.minecraft.server.MinecraftServer.w(SourceFile:749) at net.minecraft.server.MinecraftServer.v(SourceFile:656) at dfx.v(SourceFile:157) at net.minecraft.server.MinecraftServer.run(SourceFile:559) at java.lang.Thread.run(Thread.java:745)
– System Details --Details: Minecraft Version: 1.13 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: 287742448 bytes (274 MB) / 570425344 bytes (544 MB) up to 1073741824 bytes (1024 MB) JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M Profiler Position: N/A (disabled) Player Count: 0 / 8; [] Data Packs: vanilla Type: Integrated Server (map_client.txt) Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.