diff --git a/project/undo.cpp b/project/undo.cpp
index e67c38941..2fa50573a 100644
--- a/project/undo.cpp
+++ b/project/undo.cpp
@@ -1127,7 +1127,7 @@ void EditSequenceCommand::update() {
 		//		See if one exists or if you have to make one, make it
 		//		re-usable
 
-		seq->clips.at(i)->refresh();
+		if (seq->clips.at(i) != NULL) seq->clips.at(i)->refresh();
 	}
 
 	if (sequence == seq) {