From f1abfe241150369a9e2bc9be60cbd24dd4300e47 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Mon, 6 Jul 2020 10:25:37 -0400
Subject: [PATCH] avoid segfault when calling the log command without arguments

---
 src/input.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/input.cpp b/src/input.cpp
index 41501328c6..27f8db7012 100644
--- a/src/input.cpp
+++ b/src/input.cpp
@@ -1096,7 +1096,7 @@ void Input::label()
 
 void Input::log()
 {
-  if (narg > 2) error->all(FLERR,"Illegal log command");
+  if ((narg < 1) || (narg > 2)) error->all(FLERR,"Illegal log command");
 
   int appendflag = 0;
   if (narg == 2) {