From eef11b64e1a41db349b1a8a54b2f61e460483b07 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Thu, 13 Jun 2019 21:24:09 +0000
Subject: [PATCH] Do not crash if the environment variable is present but
 empty.

---
 format.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/format.c b/format.c
index c2a911f8..e1a6360a 100644
--- a/format.c
+++ b/format.c
@@ -1097,7 +1097,7 @@ format_find(struct format_tree *ft, const char *key, int modifiers)
 			envent = environ_find(ft->s->environ, key);
 		if (envent == NULL)
 			envent = environ_find(global_environ, key);
-		if (envent != NULL) {
+		if (envent != NULL && envent->value != NULL) {
 			found = xstrdup(envent->value);
 			goto found;
 		}