I have no idea what is directly causing this issue. - pretty sure its one of the following 3 though
forge 13.20.0.2227
I've been using flatworld (https://minecraft.curseforge.com/projects/flatworld?gameCategorySlug=mc-mods&projectID=254472) to fast dig. It pops a bunch of blocks at once.
I have an auto sort on a backpack set (https://minecraft.curseforge.com/projects/backpacks?gameCategorySlug=mc-mods&projectID=223957) to pick up cobble and dirt.
sometimes when using the flat tool i get the following crash report.
first line of error (for searching):
java.lang.IllegalArgumentException: Cannot get property PropertyEnum{name=variant, clazz=class net.minecraft.block.BlockStone$EnumType, values=[stone, granite, smooth_granite, diorite, smooth_diorite, andesite, smooth_andesite]} as it does not exist in BlockStateContainer{block=minecraft:air, properties=[]}
crash-2017-02-11_12.12.10-client.txt