From 173961dac588d5b7cf0d6749d1aada9050b6197a Mon Sep 17 00:00:00 2001
From: Yannis Guyon <yguyon@google.com>
Date: Fri, 4 Aug 2023 18:23:24 +0200
Subject: [PATCH] Guard diag in avifDiagnosticsClearError()

---
 src/diag.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/diag.c b/src/diag.c
index d97be9b96b..8512063a2e 100644
--- a/src/diag.c
+++ b/src/diag.c
@@ -9,7 +9,9 @@
 
 void avifDiagnosticsClearError(avifDiagnostics * diag)
 {
-    *diag->error = '\0';
+    if (diag) {
+        *diag->error = '\0';
+    }
 }
 
 #ifdef __clang__
@@ -18,7 +20,6 @@ __attribute__((__format__(__printf__, 2, 3)))
 void avifDiagnosticsPrintf(avifDiagnostics * diag, const char * format, ...)
 {
     if (!diag) {
-        // It is possible this is NULL (e.g. calls to avifFileTypeIsCompatible())
         return;
     }
     if (*diag->error) {