It is now working. For some reason this line of code was setting the lat and lng values to null and causing the error:
var TribeEventsPro = {“geocenter”:”max_lat”:”-36.848460″,”max_lng”:”174.763332″,”min_lat”:”-36.848460″,”min_lng”:”174.763332″},”map_tooltip_event”:”Event: “,”map_tooltip_address”:”Address: “};