From b1dc92ba9220055107fc2fc9a61578fa340b67d4 Mon Sep 17 00:00:00 2001
From: Chris Cromer <chris@cromer.cl>
Date: Sat, 17 Jul 2021 16:58:38 -0400
Subject: [PATCH] add check to free

---
 src/loop.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/loop.c b/src/loop.c
index 15952e6..5344420 100644
--- a/src/loop.c
+++ b/src/loop.c
@@ -51,7 +51,10 @@ void loop() {
     atexit(exit_cleanup);
     char *cwd = get_working_directory();
     set_array_list(variables, "PWD", cwd);
-    free(cwd);
+    if (cwd != NULL) {
+        free(cwd);
+        cwd = NULL;
+    }
 
     while (1) {
         print_input_line();