Warning: in_array().. Wrong datatype for second argument in ../modules/conditional_fields/conditional_fields.module on line 952

Hi all,

i'm using Conditional Fields 6.x-2.0-beta1 for handling field nested into fieldgroups alongiside with Content Profile, and i get several warnings when submitting the registration form.

warning: in_array() [function.in-array]: Wrong datatype for second argument in /var/www/arca/sites/all/modules/conditional_fields/conditional_fields.module on line 952.
warning: in_array() [function.in-array]: Wrong datatype for second argument in /var/www/arca/sites/all/modules/conditional_fields/conditional_fields.module on line 952.
warning: in_array() [function.in-array]: Wrong datatype for second argument in /var/www/arca/sites/all/modules/conditional_fields/conditional_fields.module on line 952.
........

Here is the code at line 952 of conditional_fields.module

        else {
         // Do not submit values of controlled fields which were not triggered (except on preview)
          if (variable_get('c_fields_reset_default_' . $form['type']['#value'], 1) &&
/*952*/     !in_array('node_form_build_preview', $form_state['submit_handlers']) &&
            is_array($form['#field_info'][$field_in_group]['widget']['default_value'])) {
            foreach ($form['#field_info'][$field_in_group]['widget']['default_value'] as $delta => $value) {
            $form_state['values'][$field_in_group][$delta]['value'] = $value['value'];
            }

If i comment out line 952 warnings disappear and registration process seems works correctly.

Is there any way i can ignore this check safely?

I attach my content type export too.

Regards

Daniele