I upgraded a site from 8.6.x to the latest 8.7.x core release and Charts stopped working. Where before I had a lovely C3.js line graph, now I have this error:
Notice: Undefined index: colors in Drupal\charts\Plugin\views\style\ChartsPluginStyleChart->render() (line 246 of modules/contrib/charts/src/Plugin/views/style/ChartsPluginStyleChart.php).
Fixed
3.0
Chart API
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I believe this has been fixed. The code checks if the array key isset before accessing it.
foreach ($data_field_options as $field_key) {
if (isset($field_handlers[$field_key])) {
$data_fields[$field_key] = $field_handlers[$field_key];
}
}