From: NOKUBI Takatsugu <knok@daionet.gr.jp>
Date: Fri, 9 Aug 2019 16:47:29 +0900
Subject: assign default error message

---
 src/stb_image.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/stb_image.h b/src/stb_image.h
index d0fa9c2..5f8f96d 100644
--- a/src/stb_image.h
+++ b/src/stb_image.h
@@ -875,6 +875,8 @@ static const char *stbi__g_failure_reason;
 
 STBIDEF const char *stbi_failure_reason(void)
 {
+   if (stbi__g_failure_reason == NULL)
+      stbi__g_failure_reason = "unknwon error, refer error message before assignment";
    return stbi__g_failure_reason;
 }