mc-magento: Orders grid filter by increment ID is broken after upgrade to 1.1.11

Preconditions

1. Magento 1.9.3.8
2. Install this extension version 1.1.11

Steps to reproduce

1. Go to Orders grid in admin panel
2. Filter by increment ID

Expected result

1. Orders filtered by increment ID

Actual result

1. Magento report page. The corresponding var/report file contains the following error:

SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'increment_id' in where clause is ambiguous, query was: SELECT `main_table`.*, `oe`.`mailchimp_campaign_id`, `mc`.`mailchimp_synced_flag`, `mc`.`id` FROM `sales_flat_order_grid` AS `main_table`
 LEFT JOIN `sales_flat_order` AS `oe` ON oe.entity_id=main_table.entity_id
 LEFT JOIN `mailchimp_ecommerce_sync_data` AS `mc` ON mc.related_id=main_table.entity_id AND type = 'ORD' WHERE (`increment_id` LIKE '%1271%') GROUP BY `main_table`.`entity_id` ORDER BY created_at DESC LIMIT 20