diff -r 3f841a46eab5 -r 5e309e37906e librazor/merger.c
--- a/librazor/merger.c	Fri Oct 17 10:10:57 2014 +0100
+++ b/librazor/merger.c	Fri Jul 08 17:52:02 2016 +0100
@@ -464,6 +464,10 @@
 
 	r = pool->size / sizeof *q;
 	p = list_first(files, source_pool);
+
+	if (!p)
+		return;
+
 	while (p) {
 		q = array_add(pool, sizeof *q);
 		q->data = map[p->data];