I tried spawning something with a command block

What I expected to happen was...:
Spawn primed tnt through a spawner.

What actually happened was...:
Render error... xD

Steps to Reproduce:
1. Put this into a command block:

/setblock ~1 ~-1 ~0 mob_spawner 0 replace {EntityId:20,MaxNearbyEntities:10,SpawnCount:6,SpawnRange:2,RequiredPlayerRange:16,MinSpawnDelay:50,MaxSpawnDelay:200,SpawnData:{Riding:{id:"Pig"}}}