It is most likely caused by a blank 'salesperson/purchaser code" or "approver id" in the approval user setup for the particular user requesting approval. Also ensure that all emails for all users are entered correctly in the email columns along with the appropriate approval limit settings in the approval user setup. Run query 1511 "User IDs by Notification Type" and check the result for column recipient_user_id (NAV 2016/2017). Look out for blank rows in the recipient_user_id column.
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