From 8e27fe4c0cefeacfac2a39078971260a9a245828 Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Mon, 5 Jan 2026 13:21:37 +0100
Subject: [PATCH 1/2] bufgix: prevent file data loss due to replacing an open
 file pointer

partial fix for #5275
---
 wled00/file.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/wled00/file.cpp b/wled00/file.cpp
index ba406ba3b5..f65bacb487 100644
--- a/wled00/file.cpp
+++ b/wled00/file.cpp
@@ -38,7 +38,7 @@ void closeFile() {
     DEBUGFS_PRINT(F("Close -> "));
     uint32_t s = millis();
   #endif
-  f.close();
+  if (f) f.close(); // only close if we have an open file
   DEBUGFS_PRINTF("took %lu ms\n", millis() - s);
   doCloseFile = false;
 }
@@ -271,6 +271,8 @@ bool writeObjectToFile(const char* file, const char* key, const JsonDocument* co
     s = millis();
   #endif
 
+  if (doCloseFile) closeFile(); // This prevents the loss of file data that is still cached in the File object.
+
   size_t pos = 0;
   char fileName[129]; strncpy_P(fileName, file, 128); fileName[128] = 0; //use PROGMEM safe copy as FS.open() does not
   f = WLED_FS.open(fileName, WLED_FS.exists(fileName) ? "r+" : "w+");

From a870474b49900fe5c5ebd6c8ef06a3777feb3241 Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Mon, 5 Jan 2026 19:26:39 +0100
Subject: [PATCH 2/2] Removed redundant check before closing the file handle

---
 wled00/file.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wled00/file.cpp b/wled00/file.cpp
index f65bacb487..ee107c6664 100644
--- a/wled00/file.cpp
+++ b/wled00/file.cpp
@@ -38,7 +38,7 @@ void closeFile() {
     DEBUGFS_PRINT(F("Close -> "));
     uint32_t s = millis();
   #endif
-  if (f) f.close(); // only close if we have an open file
+  f.close(); // "if (f)" check is aleady done inside f.close(), and f cannot be nullptr -> no need for double checking before closing the file handle.
   DEBUGFS_PRINTF("took %lu ms\n", millis() - s);
   doCloseFile = false;
 }