How to prevent OVER_QUERY_LIMIT with google-map-search and input #387

Hello.
I'm trying Polymer for the first time and developing a simple view like so:

<paper-input value="{{input}}"></paper-input>
<google-map-search map="{{map}}" query="{{input}}" results="{{results}}"></google-map-search> .....

It kind of works: the map updates the markers based on the results from the input typed in the paper-input element.
However, if I type too fast, I noticed the error on the console:
Cannot read property 'map' of null

After a while I found out it's returning OVER_QUERY_LIMIT status from Places Service. Is there a correct way to prevent this? Thanks!