Using /kick with target selectors gives code error

After making a tag such as banned and when you run 

/kick @a[tag=banned] No

The command block gives an error:

Syntax error: Unexpected "%2$s": at "%1$s>>%2$s<<%3$s"

but still works, just wondering if it is possible to maybe remove that code, this is low priority

Sincerely,

rafaelmanman