check for empty Context

We'd already checked for an empty Context at the beginning of the `case`
statement, but we didn't check after any functions that might have
closed the Context.

Fixes: #1799

diff --git a/index.c b/index.c
index baeaf7309e25a3bb23df8ace01340daf26566858..9e67a2913c3e33996d60387facfdedebd8e2a409 100644 (file)
--- a/index.c
+++ b/index.c
@@ -1938,7 +1938,7 @@ int mutt_index_menu(void)
         }
 
         /* check for a fatal error, or all messages deleted */
-        if (mutt_buffer_is_empty(Context->mailbox->pathbuf))
+        if (Context && Context->mailbox && mutt_buffer_is_empty(Context->mailbox->pathbuf))
           ctx_free(&Context);
 
         /* if we were in the pager, redisplay the message */