[FS#620] ip-full: monitor command throws error

[LEDE Bugs]

The following task is now closed:

FS#620 - ip-full: monitor command throws error
User who did this - yousong (yousong)

Reason for closing: Fixed
Additional comments about closing: Fixed by https://git.lede-project.org/0f23e80c272be4eaaa3e898f9e427886203be720

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=620