Board Thread:Bug Reports/@comment-24.74.100.240-20170611155053/@comment-27668672-20170611162952

The meta (or damage) of this block is used to set the mob that spawns. Valid values starts at 1. If you get this block by using an command and don't set any meta, meta is 0. Cause no mob is set for meta 0, the tooltip of this block is "null". By placing it, the game crashes cause it wants to know which type of mob should be spawned. So this is not a bug.

If you wan't an spawner, go in the "Middleearth spawning" - creative tab and get it. I would not use any commands for that.