Advanced Search - Mapping contacts function broken by theme

To reproduce -

Use advanced search to find a batch of contacts using address proximity

Make sure one or more are selected and use actions drop down > Map contacts

Blank map is displayed:

Chrome dev tool shows an error in one of the autogenerated javascript files on the mapping page - like so

var data = "<a href='/civicrm/contact/view?reset=1&amp;cid=24132'>Some User</a><br />Home<br />Some Address, Some Postcode<br /> United Kingdom<br /><br />Get Directions FROM:&nbsp; <div class="crm-section phone_main-section" style="display: none">

Theme seems to inject

<div class="crm-section phone_main-section" style="display: none">

And the double quotes in that div break the javascript.