This happens every time you try to join any sector on any planet (even the vanilla ones).
This crash report is not mine, it is provided by Furios (sqizzzzz) on official Mindustry Discord. And yea, i haven't even downloaded the mod once (i will fix it soon (tm)), so i don't understand WTFIGO too.
I understand, however, that this guy uses too much mods, but it really seems like the crash happens on FOS side, so check it out. If it is not, my apologies.
java.lang.ArrayIndexOutOfBoundsException: Index 9 out of bounds for length 1 at fos.graphics.FOSOreRenderer.cacheChunk(FOSOreRenderer.java:299) at fos.graphics.FOSOreRenderer.clearTiles(FOSOreRenderer.java:368) at fos.graphics.FOSOreRenderer.lambda$new$0(FOSOreRenderer.java:95) at arc.Events.fire(Events.java:53) at arc.Events.fire(Events.java:43) at mindustry.core.World.endMapLoad(World.java:232) at mindustry.core.World.loadGenerator(World.java:253) at mindustry.core.World.loadSector(World.java:264) at mindustry.core.World.loadSector(World.java:257) at mindustry.core.Control.playNewSector(Control.java:515) at mindustry.core.Control.lambda$playSector$33(Control.java:508) at mindustry.core.UI.lambda$loadAnd$10(UI.java:268) at arc.util.Timer$1.run(Timer.java:88) at arc.util.TaskQueue.run(TaskQueue.java:17) at arc.backend.sdl.SdlApplication.loop(SdlApplication.java:194) at arc.backend.sdl.SdlApplication.(SdlApplication.java:54) at mindustry.desktop.DesktopLauncher.main(DesktopLauncher.java:39)
Clarifying some important things: