ReferenceError: Can’t find variable: pm_get_my_friends

Hi, thanks again for this great plugin!

I have the friend system disabled. If I edit the my-profile page and wait a minute I get the following error in the console:

[Error] ReferenceError: Can't find variable: pm_get_my_friends
	(anonymous function) (profile-magic-heartbeat.js:1:208)
	dispatch (jquery.js:5430)
	trigger (jquery.js:8719)
	(anonymous function) (jquery.js:8797)
	each (jquery.js:385)
	(anonymous function) (heartbeat.js:456)
	fire (jquery.js:3500)
	fireWith (jquery.js:3630)
	done (jquery.js:9796)
	(anonymous function) (jquery.js:10057)