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1. Minecraft version: 1.12.2
2. Galacticraft version: 4.0.7
3. GalaxySpace version: 2.1.5
4. AsmodeusCore version (for 2.0.1 version and above): 1.0.3
5. Side (Single player (SSP), Multiplayer (SMP), or SSP opened to LAN (LAN)): SSP
6. Other add-ons: None

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Description of the issue:

When using the fuel removal method with crafttweaker to remove a fuel galaxy space prints "Error executing {[0:crafttweaker]: fuel_generator.zs}: null". While the fuel in question still gets removed.

The crafttweaker method used for testing:

mods.galaxyspace.removeFuelGeneratorRecipe(liquid:lava);

Screenshot/Video:

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Attached log file (or url on pastebin.com):

crafttweaker.log

[PREINITIALIZATION][CLIENT][INFO] Current loaders after merging: [[preinit]]
[PREINITIALIZATION][CLIENT][INFO] Loading scripts for loader with names [preinit]
[PREINITIALIZATION][CLIENT][INFO] [preinit | SIDE_CLIENT]: Skipping file {[0:crafttweaker]: fuel_generator.zs} as we are currently loading with a different loader
[PREINITIALIZATION][CLIENT][INFO] Completed script loading in: 2ms
[INITIALIZATION][CLIENT][INFO] CraftTweaker: Building registry
[INITIALIZATION][CLIENT][INFO] CraftTweaker: Successfully built item registry
[INITIALIZATION][CLIENT][INFO] Current loaders after merging: [[preinit], [recipeevent | crafttweaker]]
[INITIALIZATION][CLIENT][INFO] Loading scripts for loader with names [crafttweaker | recipeevent]
[INITIALIZATION][CLIENT][INFO] [crafttweaker | SIDE_CLIENT]: Loading Script: {[0:crafttweaker]: fuel_generator.zs}
[INITIALIZATION][CLIENT][INFO] Removed Fuel Generator recipe fluid for liquid:lava
[INITIALIZATION][CLIENT][ERROR] [crafttweaker]: Error executing {[0:crafttweaker]: fuel_generator.zs}: null
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
at galaxyspace.systems.SolarSystem.planets.overworld.tile.TileEntityFuelGenerator.removeFuel(TileEntityFuelGenerator.java:72)
at galaxyspace.core.integration.crafttweaker.ActionFuelGeneratorRecipes$Remove.apply(ActionFuelGeneratorRecipes.java:44)
at crafttweaker.runtime.CrTTweaker.apply(CrTTweaker.java:61)
at crafttweaker.CraftTweakerAPI.apply(CraftTweakerAPI.java:151)
at galaxyspace.core.integration.crafttweaker.CraftTweakerHandler.removeFuelGeneratorRecipe(CraftTweakerHandler.java:59)
at Fuel_generator.script(fuel_generator.zs:4)
at ZenMain.run(Fuel_generator)
at crafttweaker.runtime.CrTTweaker.loadScript(CrTTweaker.java:240)
at crafttweaker.runtime.CrTTweaker.loadScript(CrTTweaker.java:105)
at crafttweaker.mc1120.events.CommonEventHandler.registerRecipes(CommonEventHandler.java:71)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_186_CommonEventHandler_registerRecipes_Register.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:857)
at net.minecraftforge.common.crafting.CraftingHelper.loadRecipes(CraftingHelper.java:636)
at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:747)
at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:336)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:535)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[INITIALIZATION][CLIENT][INFO] Completed script loading in: 234ms
[POSTINITIALIZATION][CLIENT][INFO] Removing recipes for various outputs
[AVAILABLE][CLIENT][INFO] Fixed the RecipeBook