Issue #2393363 by Sebastien @Actualys, yatendrasingh121, tarasich,...

Issue #2393363 by Sebastien @Actualys, yatendrasingh121, tarasich, eugene.ilyin, dexcolt: PHP Fatal error:  Class name must be a valid object or a string in sites/all/modules/facetapi/plugins/facetapi/adapter.inc on line 1308