I recently updated metabox group to 1.2.9 and the update threw a fatal error.
Parse error: syntax error, unexpected '[' in /home/lstudio/public_html/wp-content/plugins/meta-box-group/class-rwmb-group-field.php on line 284
I was able to fix this error by replacing the brackets in line 284 to an array.
'attributes' => [ 'data-current' => $field['default_state'], ],
'attributes' => array( 'data-current' => $field['default_state'], ),
This site is running php version 5.3.26. I did not see this error on my local install running php version 5.6.10. Is anything I might do in my theme files to guard against this error in future updates? I am also now working on upgrading the version of php.
I'm happy to provide any more information that you might find helpful.