From 1365cc1ecc838828f0291beb0c7fb03535518469 Mon Sep 17 00:00:00 2001
From: Rene Kita <mail@rkta.de>
Date: Tue, 28 Dec 2021 16:22:51 +0100
Subject: [PATCH] Check for NULL before dereferencing a pointer

l is part of the exit condition of the while loop. If we exit the loop
because l is NULL, we cannot dereference it.
---
 file.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/file.c b/file.c
index 964d1f4..a8f2fc6 100644
--- a/file.c
+++ b/file.c
@@ -8139,7 +8139,8 @@ getNextPage(Buffer *buf, int plen)
 		l = l->next;
 	    } while (l && l->bpos);
 	    buf->firstLine = l;
-	    buf->firstLine->prev = NULL;
+	    if (l)
+		buf->firstLine->prev = NULL;
 	}
     }
   pager_end: