diff --git a/classes/Visualizer/Source.php b/classes/Visualizer/Source.php
index 4dd801ad..afaf6020 100644
--- a/classes/Visualizer/Source.php
+++ b/classes/Visualizer/Source.php
@@ -218,6 +218,7 @@ protected function _normalizeData( $data ) {
 			}
 			switch ( $series['type'] ) {
 				case 'number':
+					$data[ $i ] = preg_replace( '/[\x{200B}-\x{200D}\x{FEFF}]/u', '', $data[ $i ] );
 					$data[ $i ] = ( is_numeric( $data[ $i ] ) ) ? floatval( $data[ $i ] ) : ( is_numeric( str_replace( ',', '', $data[ $i ] ) ) ? floatval( str_replace( ',', '', $data[ $i ] ) ) : null );
 					break;
 				case 'boolean':
diff --git a/js/render-datatables.js b/js/render-datatables.js
index 2c58fdbc..fe6aaf35 100644
--- a/js/render-datatables.js
+++ b/js/render-datatables.js
@@ -247,6 +247,9 @@
                 }
                 if(typeof series.format.decimal !== ''){
                     parts[1] = series.format.decimal;
+                    if ( '' === series.format.precision ) {
+                        series.format.precision = 2;
+                    }
                 }
                 if(typeof series.format.precision !== '' && parseInt(series.format.precision) > 0){
                     parts[2] = series.format.precision;