diff --git a/modules/charts_google/src/Plugin/chart/Library/Google.php b/modules/charts_google/src/Plugin/chart/Library/Google.php
index 8409b38..7af34ab 100755
--- a/modules/charts_google/src/Plugin/chart/Library/Google.php
+++ b/modules/charts_google/src/Plugin/chart/Library/Google.php
@@ -469,7 +469,8 @@ class Google extends ChartBase implements ContainerFactoryPluginInterface {
     $data = $chart_definition['data'];
 
     // Stub out corner value.
-    $data[0][0] = isset($data[0][0]) ? $data[0][0] : 'x';
+    $data[0][0] = isset($data[0][0]) ? $data[0][0] : '';
+    $data[0][1] = isset($data[0][1]) ? $data[0][1] : '';
     if ($element['#chart_type'] === 'bubble') {
       $data[0][2] = 'bubble';
     }