Index: source/blender/src/edittime.c
===================================================================
--- source/blender/src/edittime.c	(revision 17992)
+++ source/blender/src/edittime.c	(working copy)
@@ -188,13 +188,13 @@
 	else
 		markers= &G.scene->markers;
 	
-	for (marker= markers->first; marker; marker= marker->next) {
+	for (marker= (markers ? markers->first : NULL); marker; marker= marker->next) {
 		if (marker->flag & SELECT) totmark++;
 	}
 	if (totmark==0) return;
 	
 	oldframe= MEM_mallocN(totmark*sizeof(int), "marker array");
-	for (a=0, marker= markers->first; marker; marker= marker->next) {
+	for (a=0, marker= (markers ? markers->first : NULL); marker; marker= marker->next) {
 		if (marker->flag & SELECT) {
 			oldframe[a]= marker->frame;
 			selmarker= marker;	// used for headerprint
@@ -223,7 +223,7 @@
 				apply_keyb_grid(&fac, 0.0, 1.0, 0.1, U.flag & USER_AUTOGRABGRID);
 			offs= (int)fac;
 			
-			for (a=0, marker= markers->first; marker; marker= marker->next) {
+			for (a=0, marker= (markers ? markers->first : NULL); marker; marker= marker->next) {
 				if (marker->flag & SELECT) {
 					marker->frame= oldframe[a] + offs;
 					a++;
@@ -285,7 +285,7 @@
 	
 	/* restore? */
 	if (ret_val==2) {
-		for (a=0, marker= markers->first; marker; marker= marker->next) {
+		for (a=0, marker= (markers ? markers->first : NULL); marker; marker= marker->next) {
 			if (marker->flag & SELECT) {
 				marker->frame= oldframe[a];
 				a++;