From 04fe1b966775452ea989e46d596980184882c762 Mon Sep 17 00:00:00 2001
From: M Hightower <27247790+mhightower83@users.noreply.github.com>
Date: Mon, 4 Apr 2022 01:08:14 -0700
Subject: [PATCH] Fix OOM print handling of NULL file pointer (#8527)

---
 cores/esp8266/heap.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/esp8266/heap.cpp b/cores/esp8266/heap.cpp
index 63ff49579..67f785c71 100644
--- a/cores/esp8266/heap.cpp
+++ b/cores/esp8266/heap.cpp
@@ -173,7 +173,7 @@ void IRAM_ATTR print_loc(size_t size, const char* file, int line)
         DEBUG_HEAP_PRINTF(":oom(%d)@", (int)size);
 
         bool inISR = ETS_INTR_WITHINISR();
-        if (inISR && (uint32_t)file >= 0x40200000) {
+        if (NULL == file || (inISR && (uint32_t)file >= 0x40200000)) {
             DEBUG_HEAP_PRINTF("File: %p", file);
         } else if (!inISR && (uint32_t)file >= 0x40200000) {
             char buf[strlen_P(file) + 1];