java.lang.NullPointerException
        at mcjty.rftools.blocks.logic.wireless.RedstoneReceiverTileEntity.checkOutput(RedstoneReceiverTileEntity.java:26)
        at mcjty.rftools.blocks.logic.wireless.RedstoneReceiverBlock.getWailaBody(RedstoneReceiverBlock.java:67)
        at mcjty.lib.compat.waila.WailaCompatibility.getWailaBody(WailaCompatibility.java:72)
        at mcp.mobius.waila.api.impl.MetaDataProvider.handleBlockTextData(MetaDataProvider.java:120)
        at mcp.mobius.waila.overlay.WailaTickHandler.tickClient(WailaTickHandler.java:82)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_8_WailaTickHandler_tickClient_ClientTickEvent.invoke(.dynamic)
        at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
        at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
        at net.minecraftforge.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:347)
        at net.minecraft.client.Minecraft.runTick(Minecraft.java:2036)
        at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1186)
        at net.minecraft.client.Minecraft.run(Minecraft.java:441)
        at net.minecraft.client.main.Main.main(Main.java:118)
        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:498)
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
        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:498)
        at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
        at GradleStart.main(GradleStart.java:26)