From 0fc0cdd791ce5157232dd2139238708403cdde1d Mon Sep 17 00:00:00 2001
From: Daniel-Constantin Mierla <miconda@gmail.com>
Date: Mon, 4 Mar 2024 09:07:22 +0100
Subject: [PATCH] acc: cdr - do not free static empty string in case of error

---
 src/modules/acc/acc_cdr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/modules/acc/acc_cdr.c b/src/modules/acc/acc_cdr.c
index 4ec019f1f8d..4c003e0ecab 100644
--- a/src/modules/acc/acc_cdr.c
+++ b/src/modules/acc/acc_cdr.c
@@ -113,10 +113,10 @@ int cdr_core2strar(struct dlg_cell *dlg, str *values, int *unused, char *types)
 				/* cleanup already allocated memory and
 				 * return that we didn't do anything */
 				for(i = i - 1; i >= 0; i--) {
-					if(NULL != values[i].s) {
+					if(NULL != values[i].s && types[i] != TYPE_NULL) {
 						pkg_free(values[i].s);
-						values[i].s = NULL;
 					}
+					values[i].s = NULL;
 				}
 				return 0;
 			}