Fatal error on view editing

Hello,
I have recently updated on a website the Search API module to its latest version. I also have installed Solr and Facet API to latest version. So:

Search API 7.x-1.11
Facet API 7.x-1.3
Search API Solr 7.x-1.4
Views 7.x-3.7

Now I am experiencing this error when I try to edit a view that I created previously (I can't rememeber exactly versions of the modules at the time of the creation of the view)

Recoverable fatal error: Argument 1 passed to SearchApiViewsHandlerFilterTaxonomyTerm::ids_to_strings() must be an array, string given, called in /var/www/perilmiofuturogiovani.tn.it/sites/all/modules/search_api/contrib/search_api_views/includes/handler_filter_entity.inc on line 179 and defined in SearchApiViewsHandlerFilterTaxonomyTerm->ids_to_strings() (linea 286 di /var/www/perilmiofuturogiovani.tn.it/sites/all/modules/search_api/contrib/search_api_views/includes/handler_filter_taxonomy_term.inc).

I checked the code and it is:

  /**
   * {@inheritdoc}
   */
  public function admin_summary() {
    $value = $this->value;
    $this->value = empty($value) ? '' : $this->ids_to_strings($value);
    $ret = parent::admin_summary();
    $this->value = $value;
    return $ret;
  }

I was able to fix it with a slight change adding a check and cast, but I do not know if it is correct. Anyway after that I was able to edit the view again

  /**
   * {@inheritdoc}
   */

  /* 
   * Added check on $value to see if it is an array
   */
  public function admin_summary() {
    $value = $this->value;
    $this->value = (empty($value) || !is_array($value)) ? '' : $this->ids_to_strings($value);
    $ret = parent::admin_summary();
    $this->value = $value;
    return $ret;
  }

I also attach a file with exported code of the view.
Maybe someone who is more aware of the Search API code could give it a look and see if it's something that need to be fixed or it was just the consequence of my particular settings and the update of the modules.

Thanks