[1.12] ConcurrentModificationException on teleporting

[Krutoy242]

Client crashes randomly on teleport to new point.

In most cases error happen with this stack trace (can be seen in attached debug.log):

java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
    at java.util.ArrayList$Itr.next(ArrayList.java:851)
    at net.minecraft.client.renderer.EntityRenderer.handler$zdg000$renderWorld(EntityRenderer.java:4249)

There is no RenderLib mention, but removing RenderLib fixes crashes.

Another variation of same crash looks like this:

java.util.ConcurrentModificationException
    at java.util.ArrayList.forEach(ArrayList.java:1252)
    at meldexun.renderlib.renderer.tileentity.TileEntityRenderer.fillTileEntityLists(TileEntityRenderer.java:40)
    at meldexun.renderlib.renderer.tileentity.TileEntityRendererOptifine.fillTileEntityLists(TileEntityRendererOptifine.java:26)
    at meldexun.renderlib.renderer.tileentity.TileEntityRenderer.setup(TileEntityRenderer.java:30)
    at meldexun.renderlib.renderer.tileentity.TileEntityRendererOptifine.setup(TileEntityRendererOptifine.java:18)
    at meldexun.renderlib.renderer.TileEntityRenderManager.setup(TileEntityRenderManager.java:14)
    at net.minecraft.client.renderer.RenderGlobal.handler$zdm001$setupTerrain(RenderGlobal.java:6261)

To Reproduce

This issue cant be reproduced stably on different machines. On some machines it never happens.

1. Teleport to point out of render distance
2. Use elevator (move player up or down)
3. See error

This happens to ~5% of players of my modpack E2E-E. One of players with this issue who sent me logs: https://github.com/cannonsloan

Additional info

• Settings like chunk updates and render distance didn't seem to have an impact
• Removing Optifine has no effect
• Removing EntityCulling has no effect
• Clearing all entities /cofh killall * has no effect (we though there was erroring entities)
• Raise or lower the amounts of allocated RAM has no effect
• Stopping using resource packs and shaders has no effect

Versions RenderLib: 1.0.8 Forge: 14.23.5.2860 Minecraft: 1.12.2 Other mods: About 400 mods

Log File

debug.log with crash

Another crash report example

Crash report without Optifine

[Meldexun]

Should be fixed in v1.12.2-1.1.0