fix: warning

Warning: Invalid argument supplied for foreach() in visualizer/classes/Visualizer/Module.php on line 710

Author: contactashish13

classes/Visualizer/Module.php

@@ -706,7 +706,7 @@ public static function get_chart_data( $chart, $type, $run_filter = true ) {
 		$data = unserialize( html_entity_decode( $chart->post_content ) );
 		$altered = array();
 		foreach ( $data as $index => $array ) {
-			if ( ! is_array( $index ) ) {
+			if ( ! is_array( $index ) && is_array( $array ) ) {
 				foreach ( $array as &$datum ) {
 					if ( is_string( $datum ) ) {
 						$datum = stripslashes( $datum );