As of June 22, 2016, Google Maps API no longer supports keyless access (any requet that doesn't include an API key). Please create a valid API Key and configure under Administration → Tab: Add-ons, Section JIRA Suite Utilities / Configuration. (Since Version 1.4.12 or 1.5.2)
Step By Step
Create a valid Google Maps API. For more information please follow this link!
- Open your JIRA administration console > Choose Add-Ons > Under "JIRA SUITE UTILITIES" choose "Configuration"
- Insert your valid Google Maps API in the dedicated field > click "Save"