Crash doesn't happen without Biometweaker

[23:00:27] [Server thread/ERROR] [FML/]: Caught exception from BiomeTweaker
java.lang.NullPointerException: Cannot read field "delegate" because "gen.field_76752_A" is null
at Launch//me.superckl.biometweaker.util.BiomeHelper.fillJsonObject(BiomeHelper.java:59) ~[BiomeTweaker-1.7.10-2.0.182.jar:?]
at Launch//me.superckl.biometweaker.BiomeTweaker.generateOutputFiles(BiomeTweaker.java:181) ~[BiomeTweaker.class:?]
at Launch//me.superckl.biometweaker.BiomeTweaker.onLoadComplete(BiomeTweaker.java:172) ~[BiomeTweaker.class:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at Launch//cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532) ~[forge-1.7.10-10.13.4.1614-1.7.10-universal.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?]
at Launch//cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212) ~[LoadController.class:?]
at Launch//cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190) ~[LoadController.class:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?]
at Launch//cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119) ~[LoadController.class:?]
at Launch//cpw.mods.fml.common.Loader.initializeMods(Loader.java:745) ~[Loader.class:?]
at Launch//cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:311) ~[FMLClientHandler.class:?]
at Launch//net.minecraft.client.Minecraft.func_71384_a(Unknown Source) ~[bao.class:?]
at Launch//net.minecraft.client.Minecraft.func_99999_d(Unknown Source) ~[bao.class:?]
at Launch//net.minecraft.client.main.Main.main(SourceFile:148) ~[minecraft-1.7.10-client.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//net.minecraft.launchwrapper.Launch.rfb$realLaunch(Launch.java:250) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at System//net.minecraft.launchwrapper.Launch.launch(Launch.java:35) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at System//net.minecraft.launchwrapper.Launch.main(Launch.java:60) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at com.gtnewhorizons.retrofuturabootstrap.Main.main(Main.java:207) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//org.polymc.impl.OneSixLauncher.invokeMain(OneSixLauncher.java:104) ~[OneSixLauncher.class:?]
at System//org.polymc.impl.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:176) ~[OneSixLauncher.class:?]
at System//org.polymc.impl.OneSixLauncher.launch(OneSixLauncher.java:186) ~[OneSixLauncher.class:?]
at System//org.polymc.EntryPoint.listen(EntryPoint.java:144) ~[EntryPoint.class:?]
at System//org.polymc.EntryPoint.main(EntryPoint.java:74) ~[EntryPoint.class:?]
[23:00:27] [Server thread/ERROR] [FML/]: A fatal exception occurred during the server about to start event
java.lang.NullPointerException: Cannot read field "delegate" because "gen.field_76752_A" is null
at Launch//me.superckl.biometweaker.util.BiomeHelper.fillJsonObject(BiomeHelper.java:59) ~[BiomeTweaker-1.7.10-2.0.182.jar:?]
at Launch//me.superckl.biometweaker.BiomeTweaker.generateOutputFiles(BiomeTweaker.java:181) ~[BiomeTweaker.class:?]
at Launch//me.superckl.biometweaker.BiomeTweaker.onLoadComplete(BiomeTweaker.java:172) ~[BiomeTweaker.class:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at Launch//cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532) ~[forge-1.7.10-10.13.4.1614-1.7.10-universal.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?]
at Launch//cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212) ~[LoadController.class:?]
at Launch//cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190) ~[LoadController.class:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?]
at System//com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?]
at Launch//cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119) ~[LoadController.class:?]
at Launch//cpw.mods.fml.common.Loader.initializeMods(Loader.java:745) ~[Loader.class:?]
at Launch//cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:311) ~[FMLClientHandler.class:?]
at Launch//net.minecraft.client.Minecraft.func_71384_a(Unknown Source) ~[bao.class:?]
at Launch//net.minecraft.client.Minecraft.func_99999_d(Unknown Source) ~[bao.class:?]
at Launch//net.minecraft.client.main.Main.main(SourceFile:148) ~[minecraft-1.7.10-client.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//net.minecraft.launchwrapper.Launch.rfb$realLaunch(Launch.java:250) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at System//net.minecraft.launchwrapper.Launch.launch(Launch.java:35) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at System//net.minecraft.launchwrapper.Launch.main(Launch.java:60) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at com.gtnewhorizons.retrofuturabootstrap.Main.main(Main.java:207) ~[lwjgl3ify-2.1.9-forgePatches.jar:?]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[?:?]
at System//org.polymc.impl.OneSixLauncher.invokeMain(OneSixLauncher.java:104) ~[OneSixLauncher.class:?]
at System//org.polymc.impl.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:176) ~[OneSixLauncher.class:?]
at System//org.polymc.impl.OneSixLauncher.launch(OneSixLauncher.java:186) ~[OneSixLauncher.class:?]
at System//org.polymc.EntryPoint.listen(EntryPoint.java:144) ~[EntryPoint.class:?]
at System//org.polymc.EntryPoint.main(EntryPoint.java:74) ~[EntryPoint.class:?]

fml-client-latest.log