1 files changed, 2 insertions, 0 deletions
diff --git a/rfc822.c b/rfc822.c
index efa92f9c..beff379d 100644
--- a/rfc822.c
+++ b/rfc822.c
@@ -247,6 +247,8 @@ char *nxtaddr(const char *hdr /* header to be parsed, NUL to continue previous h
 	tp = 0;
     }
 
+    if (!hp) return NULL;
+
     for (; *hp; hp++)
     {
 #ifdef MAIN