diff --git a/rtmp/session.go b/rtmp/session.go
index aa4c0ac2..8ba30d1c 100644
--- a/rtmp/session.go
+++ b/rtmp/session.go
@@ -152,7 +152,7 @@ func (s *Session) Open() error {
 }
 
 // Close terminates the rtmp connection.
-// NB: The session object is cleared completely.
+// NB: Close is idempotent and the session value is cleared completely.
 func (s *Session) Close() error {
 	s.log(DebugLevel, pkg+"Session.Close")
 	if !s.isConnected() {
@@ -174,12 +174,12 @@ func (s *Session) Write(data []byte) (int, error) {
 	if !s.isConnected() {
 		return 0, errNotConnected
 	}
-	if data[0] == packetTypeInfo || (data[0] == 'F' && data[1] == 'L' && data[2] == 'V') {
-		return 0, errUnimplemented
-	}
 	if len(data) < minDataSize {
 		return 0, errTinyPacket
 	}
+	if data[0] == packetTypeInfo || (data[0] == 'F' && data[1] == 'L' && data[2] == 'V') {
+		return 0, errUnimplemented
+	}
 
 	pkt := packet{
 		packetType: data[0],