diff --git a/filestore.go b/filestore.go
index 6d010f897..0e63ab346 100644
--- a/filestore.go
+++ b/filestore.go
@@ -239,34 +239,34 @@ func (store *fileStore) NextTargetMsgSeqNum() int {
 
 // SetNextSenderMsgSeqNum sets the next MsgSeqNum that will be sent
 func (store *fileStore) SetNextSenderMsgSeqNum(next int) error {
-	if err := store.cache.SetNextSenderMsgSeqNum(next); err != nil {
-		return errors.Wrap(err, "cache")
+	if err := store.setSeqNum(store.senderSeqNumsFile, next); err != nil {
+		return errors.Wrap(err, "file")
 	}
-	return store.setSeqNum(store.senderSeqNumsFile, next)
+	return store.cache.SetNextSenderMsgSeqNum(next)
 }
 
 // SetNextTargetMsgSeqNum sets the next MsgSeqNum that should be received
 func (store *fileStore) SetNextTargetMsgSeqNum(next int) error {
-	if err := store.cache.SetNextTargetMsgSeqNum(next); err != nil {
-		return errors.Wrap(err, "cache")
+	if err := store.setSeqNum(store.targetSeqNumsFile, next); err != nil {
+		return errors.Wrap(err, "file")
 	}
-	return store.setSeqNum(store.targetSeqNumsFile, next)
+	return store.cache.SetNextTargetMsgSeqNum(next)
 }
 
 // IncrNextSenderMsgSeqNum increments the next MsgSeqNum that will be sent
 func (store *fileStore) IncrNextSenderMsgSeqNum() error {
-	if err := store.cache.IncrNextSenderMsgSeqNum(); err != nil {
-		return errors.Wrap(err, "cache")
+	if err := store.SetNextSenderMsgSeqNum(store.cache.NextSenderMsgSeqNum() + 1); err != nil {
+		return errors.Wrap(err, "file")
 	}
-	return store.setSeqNum(store.senderSeqNumsFile, store.cache.NextSenderMsgSeqNum())
+	return nil
 }
 
 // IncrNextTargetMsgSeqNum increments the next MsgSeqNum that should be received
 func (store *fileStore) IncrNextTargetMsgSeqNum() error {
-	if err := store.cache.IncrNextTargetMsgSeqNum(); err != nil {
-		return errors.Wrap(err, "cache")
+	if err := store.SetNextTargetMsgSeqNum(store.cache.NextTargetMsgSeqNum() + 1); err != nil {
+		return errors.Wrap(err, "file")
 	}
-	return store.setSeqNum(store.targetSeqNumsFile, store.cache.NextTargetMsgSeqNum())
+	return nil
 }
 
 // CreationTime returns the creation time of the store
diff --git a/mongostore.go b/mongostore.go
index e50af2c16..0933e65a4 100644
--- a/mongostore.go
+++ b/mongostore.go
@@ -220,18 +220,18 @@ func (store *mongoStore) SetNextTargetMsgSeqNum(next int) error {
 
 // IncrNextSenderMsgSeqNum increments the next MsgSeqNum that will be sent
 func (store *mongoStore) IncrNextSenderMsgSeqNum() error {
-	if err := store.cache.IncrNextSenderMsgSeqNum(); err != nil {
-		return errors.Wrap(err, "cache incr")
+	if err := store.SetNextSenderMsgSeqNum(store.cache.NextSenderMsgSeqNum() + 1); err != nil {
+		return errors.Wrap(err, "save sequence number")
 	}
-	return store.SetNextSenderMsgSeqNum(store.cache.NextSenderMsgSeqNum())
+	return nil
 }
 
 // IncrNextTargetMsgSeqNum increments the next MsgSeqNum that should be received
 func (store *mongoStore) IncrNextTargetMsgSeqNum() error {
-	if err := store.cache.IncrNextTargetMsgSeqNum(); err != nil {
-		return errors.Wrap(err, "cache incr")
+	if err := store.SetNextTargetMsgSeqNum(store.cache.NextTargetMsgSeqNum() + 1); err != nil {
+		return errors.Wrap(err, "save sequence number")
 	}
-	return store.SetNextTargetMsgSeqNum(store.cache.NextTargetMsgSeqNum())
+	return nil
 }
 
 // CreationTime returns the creation time of the store
@@ -266,6 +266,11 @@ func (store *mongoStore) GetMessages(beginSeqNum, endSeqNum int) (msgs [][]byte,
 	}
 
 	iter := store.db.DB(store.mongoDatabase).C(store.messagesCollection).Find(seqFilter).Sort("msgseq").Iter()
+	if iter.Err() != nil {
+		err = iter.Err()
+		_ = iter.Close()
+		return
+	}
 	for iter.Next(msgFilter) {
 		msgs = append(msgs, msgFilter.Message)
 	}
diff --git a/sqlstore.go b/sqlstore.go
index 3569359af..662b3cffa 100644
--- a/sqlstore.go
+++ b/sqlstore.go
@@ -237,18 +237,18 @@ func (store *sqlStore) SetNextTargetMsgSeqNum(next int) error {
 
 // IncrNextSenderMsgSeqNum increments the next MsgSeqNum that will be sent
 func (store *sqlStore) IncrNextSenderMsgSeqNum() error {
-	if err := store.cache.IncrNextSenderMsgSeqNum(); err != nil {
-		return errors.Wrap(err, "cache incr next")
+	if err := store.SetNextSenderMsgSeqNum(store.cache.NextSenderMsgSeqNum() + 1); err != nil {
+		return errors.Wrap(err, "store next")
 	}
-	return store.SetNextSenderMsgSeqNum(store.cache.NextSenderMsgSeqNum())
+	return nil
 }
 
 // IncrNextTargetMsgSeqNum increments the next MsgSeqNum that should be received
 func (store *sqlStore) IncrNextTargetMsgSeqNum() error {
-	if err := store.cache.IncrNextTargetMsgSeqNum(); err != nil {
-		return errors.Wrap(err, "cache incr next")
+	if err := store.SetNextTargetMsgSeqNum(store.cache.NextTargetMsgSeqNum() + 1); err != nil {
+		return errors.Wrap(err, "store next")
 	}
-	return store.SetNextTargetMsgSeqNum(store.cache.NextTargetMsgSeqNum())
+	return nil
 }
 
 // CreationTime returns the creation time of the store