From a1b09ea2caeceab4077295649f5ededa8d3510b7 Mon Sep 17 00:00:00 2001
From: parkrrrr <parkrrrr>
Date: Tue, 5 Aug 2003 15:02:01 +0000
Subject: [PATCH] duplicate filter would crash if there wre no waypoints in the
 list

---
 duplicate.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/duplicate.c b/duplicate.c
index 570cf3701..15fe41ce4 100644
--- a/duplicate.c
+++ b/duplicate.c
@@ -273,7 +273,9 @@ duplicate_process(void)
 	}
 
 	xfree(htable);
-	free_tree(sup_tree);
+	if ( sup_tree ) {
+		free_tree(sup_tree);
+	}
 }
 
 void
-- 
2.30.2