[1.14] Log Spam/stutter with Undo

The message in the log:
[17:20:26] [Client thread/FATAL]: Error executing task on Client
java.lang.NullPointerException: null
    at nl.requios.effortlessbuilding.buildmodifier.UndoRedo.addUndo(UndoRedo.java:35) ~[?:1.14.4-2.16]
    at nl.requios.effortlessbuilding.network.AddUndoMessage$Handler.lambda$handle$0(AddUndoMessage.java:75) ~[?:1.14.4-2.16]
    at net.minecraftforge.fml.network.NetworkEvent$Context.enqueueWork(NetworkEvent.java:215) ~[?:?]
    at nl.requios.effortlessbuilding.network.AddUndoMessage$Handler.handle(AddUndoMessage.java:69) ~[?:1.14.4-2.16]
    at net.minecraftforge.fml.network.simple.IndexedMessageCodec.lambda$tryDecode$3(IndexedMessageCodec.java:124) ~[?:?]
    at java.util.Optional.ifPresent(Unknown Source) ~[?:1.8.0_231]
    at net.minecraftforge.fml.network.simple.IndexedMessageCodec.tryDecode(IndexedMessageCodec.java:124) ~[?:?]
    at net.minecraftforge.fml.network.simple.IndexedMessageCodec.consume(IndexedMessageCodec.java:157) ~[?:?]
    at net.minecraftforge.fml.network.simple.SimpleChannel.networkEventListener(SimpleChannel.java:79) ~[?:?]
    at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:212) ~[eventbus-1.0.0-service.jar:?]
    at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:204) ~[eventbus-1.0.0-service.jar:?]
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-1.0.0-service.jar:?]
    at net.minecraftforge.fml.network.NetworkInstance.dispatch(NetworkInstance.java:84) ~[?:?]
    at net.minecraftforge.fml.network.NetworkHooks.lambda$onCustomPayload$0(NetworkHooks.java:74) ~[?:?]
    at java.util.Optional.map(Unknown Source) ~[?:1.8.0_231]
    at net.minecraftforge.fml.network.NetworkHooks.onCustomPayload(NetworkHooks.java:74) ~[?:?]
    at net.minecraft.client.network.play.ClientPlayNetHandler.func_147240_a(ClientPlayNetHandler.java:1783) ~[?:?]
    at net.minecraft.network.play.server.SCustomPayloadPlayPacket.func_148833_a(SCustomPayloadPlayPacket.java:55) ~[?:?]
    at net.minecraft.network.play.server.SCustomPayloadPlayPacket.func_148833_a(SCustomPayloadPlayPacket.java:11) ~[?:?]
    at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:33) ~[?:?]
    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(ThreadTaskExecutor.java:170) ~[?:?]
    at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?]
    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(ThreadTaskExecutor.java:135) ~[?:?]
    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213160_bf(ThreadTaskExecutor.java:115) ~[?:?]
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:861) ~[?:?]
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:384) ~[?:?]
    at net.minecraft.client.main.Main.main(SourceFile:155) ~[client-1.14.4.jar:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_231]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_231]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_231]
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) ~[forge-1.14.4-28.1.111.jar:28.1]
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-4.1.0.jar:?]
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-4.1.0.jar:?]
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-4.1.0.jar:?]
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-4.1.0.jar:?]
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-4.1.0.jar:?]
I’ve attached a full log.
I’m using:
Effortless Building 2.16 for 1.14.4
Minecraft 1.14.4
Forge 28.1.111
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