Game Crash When Opening Realms

I don't know how it happened but my game just crashed when I clicked "Configure realm".

 

Here's my crash report:

---- Minecraft Crash Report ----

// I bet Cylons wouldn't have this problem.

Time: 9/21/18 9:24 AM

Description: Rendering screen

java.util.ConcurrentModificationException

at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)

at java.util.ArrayList$Itr.next(ArrayList.java:851)

at ciy.k(SourceFile:202)

at net.minecraft.realms.RealmsScreen.render(SourceFile:102)

at com.mojang.realmsclient.gui.screens.RealmsConfigureWorldScreen.render(RealmsConfigureWorldScreen.java:205)

at ciy.a(SourceFile:102)

at ctx.a(SourceFile:792)

at cfs.c(SourceFile:850)

at cfs.a(SourceFile:395)

at net.minecraft.client.main.Main.main(SourceFile:144)

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

– Head –

Thread: Client thread

Stacktrace:

at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)

at java.util.ArrayList$Itr.next(ArrayList.java:851)

at ciy.k(SourceFile:202)

at net.minecraft.realms.RealmsScreen.render(SourceFile:102)

at com.mojang.realmsclient.gui.screens.RealmsConfigureWorldScreen.render(RealmsConfigureWorldScreen.java:205)

at ciy.a(SourceFile:102)

– Screen render details –

Details:

Screen name: ciy

Mouse location: Scaled: (365, 60). Absolute: (1460.000000, 240.000000)

Screen size: Scaled: (480, 270). Absolute: (1920, 1080). Scale factor of 4.000000

Stacktrace:

at ctx.a(SourceFile:792)

at cfs.c(SourceFile:850)

at cfs.a(SourceFile:395)

at net.minecraft.client.main.Main.main(SourceFile:144)

– System Details –

Details:

Minecraft Version: 1.13.1

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: 374920840 bytes (357 MB) / 1073741824 bytes (1024 MB) up to 5368709120 bytes (5120 MB)

JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx5G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M

Launched Version: 1.13.1

LWJGL: 3.1.6 build 14

OpenGL: Intel(R) HD Graphics 5500 GL version 4.4.0 - Build 20.19.15.4642, Intel

GL Caps: Using GL 1.3 multitexturing.

Using GL 1.3 texture combiners.

Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.

Shaders are available because OpenGL 2.1 is supported.

VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes

Is Modded: Probably not. Jar signature remains and client brand is untouched.

Type: Client (map_client.txt)

Resource Packs: vanilla, file/Better Buttons

Current Language: English (US)

Profiler Position: N/A (disabled)

CPU: 4x Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz