Filter: convert filter array to include all strings. Fixes #1070

js/widgets/widget-filter.js

@@ -838,6 +838,8 @@
 				c.lastCombinedFilter = null;
 				c.lastSearch = [];
 			}
+			// convert filters to strings (maybe not the best method)- see #1070
+			filters = filters.join( '\u0000' ).split( '\u0000' );
 			if ( wo.filter_initialized ) {
 				c.$table.trigger( 'filterStart', [ filters ] );
 			}