Fixes analyzer issue
Fixes analyzer issue

Variable 'backgroundTask' could be uninitialized when captured by block.
mixpanel/mixpanel-iphone,lovesunstar/mixpanel-iphone,depop/mixpanel-iphone,carezone/mixpanel-iphone,lovesunstar/mixpanel-iphone,depop/mixpanel-iphone,carezone/mixpanel-iphone,mixpanel/mixpanel-iphone,lovesunstar/mixpanel-iphone,lovesunstar/mixpanel-iphone,mixpanel/mixpanel-iphone,depop/mixpanel-iphone,mixpanel/mixpanel-iphone,depop/mixpanel-iphone,mixpanel/mixpanel-iphone