Check last state in Chrome Extension

[Bob The Builder]

I am not sure if there is the right group, if not please let me know where this should go.  

I have a Chrome extension I am working on that queries a remote server and shows a desktop notification when it changes.  I am using an event page which will frequently go to sleep so I use a Google Alarm to have it do a check every 5 minutes. I save the last state out into a variable and compare it to current state to determine if a desktop notification should be displayed.  I'm finding this last state variable is frequently going undefined when chrome is not in the foreground or under other conditions.  I have a few variables this may be happening to as well.

How do I prevent this from happening?

[Hector Carmona]

Extension development questions should be directed at stack overflow. As per the instructions here.

Best regards!

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Hector Carmona |

Software Engineer |

hcar...@google.com