From 082d1eea48dc3ffb3b8f152d8fb044e68e16129a Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Thu, 14 Dec 2023 15:58:45 +0100
Subject: [PATCH] oappend robustness improvement

obuf is reset to nullptr in some cases
---
 wled00/util.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wled00/util.cpp b/wled00/util.cpp
index 8c8ff7256..914f09ee3 100644
--- a/wled00/util.cpp
+++ b/wled00/util.cpp
@@ -148,7 +148,7 @@ bool oappendi(int i)
 bool oappend(const char* txt)
 {
   uint16_t len = strlen(txt);
-  if (olen + len >= SETTINGS_STACK_BUF_SIZE) {
+  if ((obuf == nullptr) || (olen + len >= SETTINGS_STACK_BUF_SIZE)) { // sanity checks
 #ifdef WLED_DEBUG
     DEBUG_PRINT(F("oappend() buffer overflow. Cannot append "));
     DEBUG_PRINT(len); DEBUG_PRINT(F(" bytes \t\""));