Fix panic when stopping import progress during loading mailboxes info

internal/transfer/provider_imap_source.go

@@ -46,8 +46,12 @@ func (p *IMAPProvider) TransferTo(rules transferRules, progress *Progress, ch ch
 	imapMessageInfoMap := p.loadMessageInfoMap(rules, progress)
 
 	for rule := range rules.iterateActiveRules() {
-		log.WithField("rule", rule).Debug("Processing rule")
 		messagesInfo := imapMessageInfoMap[rule.SourceMailbox.Name]
+		if messagesInfo == nil {
+			log.WithField("rule", rule).Warn("Rule has no message info")
+			continue
+		}
+		log.WithField("rule", rule).Debug("Processing rule")
 		p.transferTo(rule, messagesInfo, progress, ch)
 	}
 }
@@ -67,6 +71,10 @@ func (p *IMAPProvider) loadMessageInfoMap(rules transferRules, progress *Progres
 			mailbox, err = p.selectIn(mailboxName)
 			return err
 		})
+		if mailbox == nil {
+			log.WithField("rule", rule.SourceMailbox.Name).Warn("Failed to select into mailbox")
+			continue
+		}
 		if mailbox.Messages == 0 {
 			continue
 		}

unreleased.md

@@ -25,6 +25,7 @@ Changelog [format](http://keepachangelog.com/en/1.0.0/)
 * GODT-951 Properly parse message with long lines in header and long header split to multiple lines (upgrading to latest go-message).
 * GODT-894 Fix panic when sending while account is logging in.
 * GODT-831 Fix reporting bug from accounts with empty account name.
+* GODT-991 Fix panic when stopping import progress during loading mailboxes info.
 
 ### Changed
 * GODT-97 Don't log errors caused by SELECT "".