Error: "Failed to get mail 2 due to error: sql: no rows in result set"

[adbenitez]

Describe the bug
I get this error in the logs:

[  Yggmail  ] Queued mail for [4c5c81b8379f58ab0f3af9ed186988fb2a05a7c0c90829283e8bb9f0e3438058@yggmail]                                                              
[  Yggmail  ] There are 2 mail(s) queued for 4c5c81b8379f58ab0f3af9ed186988fb2a05a7c0c90829283e8bb9f0e3438058                                                         
[  Yggmail  ] Sending mail from 439a18f3692be6cc3bdf724994d6027a1dc457ef8adf33d68564205c03b3ad46@yggmail to 4c5c81b8379f58ab0f3af9ed186988fb2a05a7c0c90829283e8bb9f0e3438058                                                                                                                                                                 
[  Yggmail  ] Queued mail for [4c5c81b8379f58ab0f3af9ed186988fb2a05a7c0c90829283e8bb9f0e3438058@yggmail]                                                              
[  Yggmail  ] Sent mail from 439a18f3692be6cc3bdf724994d6027a1dc457ef8adf33d68564205c03b3ad46@yggmail to 4c5c81b8379f58ab0f3af9ed186988fb2a05a7c0c90829283e8bb9f0e3438058                                                                                                                                                                    
[  Yggmail  ] Failed to get mail 2 due to error: sql: no rows in result set
[  Yggmail  ] Incoming SMTP session from 4c5c81b8379f58ab0f3af9ed186988fb2a05a7c0c90829283e8bb9f0e3438058
// [...] THE SECOND QUEUED MESSAGE WAS NOT SENT DUE TO THE PREVIOUS ERROR