Do not try this in your normal world! It can't be reloaded then anymore! (You can only fix this at the moment with MCEdit)
Perform this command:
/setblock ~ ~ ~ mob_spawner 0 replace {EntityId:Item}
Minecraft will crash
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It should give a error message or won't spawn an item, but it definitely should not try to spawn a item without an ID.
Also:
Using the "/summon Item" command will spawn Stone!
Can you please reopen it?
it try's to render an dropped item, but it doesn't know what item to render, because you didn't say what item, so it crashed
Well don't do that, then. You're creating an ItemEntity with no associated item, what did you expect to happen?