Random crash

[BlueYoshi68]

Not sure why im bothering to type this, but tech guns is crashing for no reason. java.lang.ArrayIndexOutOfBoundsException: 5 at net.minecraftforge.client.model.pipeline.VertexLighterFlat.processQuad(VertexLighterFlat.java:237) at net.minecraftforge.client.model.pipeline.QuadGatheringTransformer.put(QuadGatheringTransformer.java:66) at net.minecraftforge.client.model.pipeline.UnpackedBakedQuad.pipe(UnpackedBakedQuad.java:78) at techguns.client.render.entities.npcs.RenderAttackHelicopter.renderBakedModel(RenderAttackHelicopter.java:153) at techguns.client.render.entities.npcs.RenderAttackHelicopter.doRender(RenderAttackHelicopter.java:103) at techguns.client.render.entities.npcs.RenderAttackHelicopter.doRender(RenderAttackHelicopter.java:34) at net.minecraft.client.renderer.entity.RenderManager.renderEntity(RenderManager.java:412) at net.minecraft.client.renderer.entity.RenderManager.renderEntityStatic(RenderManager.java:392) at net.minecraft.client.renderer.RenderGlobal.redirect$zcj000$renderEntityStatic(RenderGlobal.java:3727) at net.minecraft.client.renderer.RenderGlobal.renderEntities(RenderGlobal.java:839) at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1800) at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1613) at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1384) at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1119) at net.minecraft.client.Minecraft.run(Minecraft.java:3942) at net.minecraft.client.main.Main.main(SourceFile:123) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

[pWn3d1337]

I think this crash is caused by optifine