Newly found bug/crash?

I just got disconnected kicked from the game.

"Exception: Attempted to resume detached action with an invalid skill: 0 object: Metadata/Monsters/Totems/SpellTotem@38

See attached image

My sockets on spell totem was "Tornado/Frostbolt/Ice Nova/Prolonged Duration", but ive used it for the last 2 maps with no issue

Kinda forgot already about it, but could you explain why I cant socket "Bone Cage" on Spell totem?

I wanted to use it to pin enemies so I can use bone shrapnel support on my main skill, but the spell totem wont let me socket bone cage on it.

The only restritcion it has is that it cannoy use skills which have a cooldown, but bone cage doesnt have cd :/