Illegal offset type in isset or empty en context_get_plugin() (línea 540 de .../sites/all/modules/context/context.module).

After updating some modules and drupal core. The isotope module stop working, main error said "jquery.isotope.min.js not found", so I add the missing file but then this appeared.

here is the block of code, the first line is the problem :

      if (isset($plugins[$info['plugin']]) && $class = ctools_plugin_get_class($plugins[$info['plugin']], 'handler')) {
       // Check that class exists until CTools & registry issues are resolved.
        if (class_exists($class)) {
          $cache[$type][$key] = new $class($key, $info);
        }
      }

adding @ to isset (as suggested in other post) didn´t work for me.

I tried printing the variables content but no luck.