Works great, but php error code displays on page

Great plugin! We have this installed on 3 sites, and the plugin works on all 3. However, 2 sites that are hosted on godaddy display this error message above the map on the page:

Warning: array_key_exists() expects parameter 2 to be array, null given in /home/weathergo/public_html/wp-content/plugins/stormia-live-weather-radar-map/stormia.php on line 30

Another dev site we have hosted on hawkhost, does not display the error message.

We are using this short code in each instance:

[stormia width=”800″ height=”500″]

Thanks for this very awesome plugin and for your help!

https://wordpress.org/plugins/stormia-live-weather-radar-map/