diff --git a/fast-import.c b/fast-import.c
index cdd629d6bc547609daabab6c1f3b73939fddb7b9..6c43a0d37f781294a8844ea52c9ce9728396f456 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1193,6 +1193,8 @@ static int tree_content_set(
 		n = slash1 - p;
 	else
 		n = strlen(p);
+	if (!n)
+		die("Empty path component found in input");
 
 	for (i = 0; i < t->entry_count; i++) {
 		e = t->entries[i];