It just crashes after like idk more than half an hour maybe I'm not an expert at this stuff
here's the log i was advised to send:

java.lang.RuntimeException: null
at icbm.classic.lib.radar.RadarMap.remove(RadarMap.java:203) [RadarMap.class:6.5.3]
at icbm.classic.lib.radar.RadarRegistry.chunkUnload(RadarRegistry.java:171) [RadarRegistry.class:6.5.3]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_1408_RadarRegistry_chunkUnload_Unload.invoke(.dynamic) [?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) [ASMEventHandler.class:?]
at com.github.terminatornl.laggoggles.tickcentral.EventBusTransformer.redirectEvent(EventBusTransformer.java:67) [LagGoggles-1.12.2-5.9-140.jar:1.12.2-5.9-140]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) [EventBus.class:?]
at net.minecraft.world.chunk.Chunk.onUnload(Chunk.java:879) [axw.class:?]
at net.minecraft.client.multiplayer.ChunkProviderClient.unloadChunk(ChunkProviderClient.java:47) [brx.class:?]
at net.minecraft.client.multiplayer.WorldClient.doPreChunk(WorldClient.java:189) [bsb.class:?]
at net.minecraft.client.network.NetHandlerPlayClient.processChunkUnload(NetHandlerPlayClient.java:768) [brz.class:?]
at net.minecraft.network.play.server.SPacketUnloadChunk.processPacket(SourceFile:35) [jb.class:?]
at net.minecraft.network.play.server.SPacketUnloadChunk.processPacket(SourceFile:8) [jb.class:?]
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) [hv$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_51]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_51]
at net.minecraft.util.Util.runTask(SourceFile:529) [h.class:?]
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1088) [bib.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:5614) [bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]

im pretty sure i was told the recent update of this mod caused the game to crash

Version 6.5.4 should fix the issue. If it doesn't feel free to reopen the issue with a complete server log.

Duplicate of #444 but likely being triggered more often recently