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[Drupal] How to update / modify the data submitted via Drupal webform when submitting the form?

Webform is a Drupal module that can help webmasters create submission forms like survey forms, contest forms, contact us form etc without any custom programming. Usually webform submissions will result in the data being inserted as a new row into table 'webform_submitted_data'. But our client requirement was to update an existing submitted data from the table 'webform_submitted_data'. If you want to know how to update an existing webform submission then continue reading

[SOLVED][Drupal Webform] Undefined index: webform_client_form_XXX in drupal_retrieve_form()

A lot of Drupal users were encountering "Undefined index: webform_client_form_112 in drupal_retrieve_form() (line 738 of /****/html/includes/" on their Drupal site and the Webform module remained hidden until the cache was cleared. If you are facing the same issue with Drupal Webform in your Drupal site then read on to find out the solution.