Index: libs/evoral/evoral/midi_util.h
===================================================================
--- libs/evoral/evoral/midi_util.h	(revision 4650)
+++ libs/evoral/evoral/midi_util.h	(working copy)
@@ -102,6 +102,10 @@
 static inline bool
 midi_event_is_valid(const uint8_t* buffer, size_t len)
 {
+	if(buffer == 0){
+		return false;
+	}
+
 	uint8_t status = buffer[0];
 	if (status < 0x80) {
 		return false;