Name NBT tag doesn't work.

I was trying to make someting with command blocks. And i wanted to execute a command AT a certain entity. But when I tested it, i found out that the name in the command don't work, or I'm doing something wrong. But i have tested EVERYTHING. This is the command I use: /summon WitherSkull ~ ~ ~ {CustomName:"climb",direction:[0.0,0.0,0.0]}, to summon. And then i use: @e[type=WitherSkull,name=climb] in the specifier in the other command. I tested without the name thing, and it worked perfectly. But when i add the name specifier, it wont register. I don't know if this is a bug, or I am doing anything wrong. Thanks.