Missing argument 1 for apachesolr_has_searched()

After updating the Apache Solr module to 7.x-1.0-beta15 we got the following error message:

Warning: Missing argument 1 for apachesolr_has_searched(), called in /var/www/xxx/sites/all/modules/contrib/apachesolr_stats/apachesolr_stats.module on line 173 and defined in apachesolr_has_searched() (regel 935 van /var/www/xxx/sites/all/modules/contrib/apachesolr/apachesolr.module).

This is because apachesolr_has_searched now requires an env_id argument. The quick fix is to use apachesolr_default_environment() but obviously the stats will only work for the default search environment:

Index: apachesolr_stats.module
--- apachesolr_stats.module Base (BASE)
+++ apachesolr_stats.module Locally Modified (Based On LOCAL)
@@ -170,10 +170,10 @@
     return;
   }
 
-  if (! apachesolr_has_searched()) {
+  if (!apachesolr_has_searched(apachesolr_default_environment())) {
     return;
   }
-  $query = apachesolr_current_query();
+  $query = apachesolr_current_query(apachesolr_default_environment());
   $response = apachesolr_static_response_cache($query->getSearcher());
   $num_suggestions = 0;
   if (isset($response->spellcheck) && isset($response->spellcheck->suggestions) && $response->spellcheck->suggestions != NULL) {