diff --git a/frameworks/libhilog/vsnprintf/output_p.inl b/frameworks/libhilog/vsnprintf/output_p.inl
index eb6ba050ff49a53068b7cc58aa54b2f986aa133e..7e015ba5eb8c406b1d79be083af08b52c27ffc75 100644
--- a/frameworks/libhilog/vsnprintf/output_p.inl
+++ b/frameworks/libhilog/vsnprintf/output_p.inl
@@ -494,6 +494,9 @@ int SecOutputPS(SecPrintfStream *stream, int priv, const char *cformat, va_list
     /* loop each format character */
     /* remove format != NULL */
     while ((ch = *format++) != SECUREC_CHAR('\0') && charsOut >= 0) {
+        if (!format) {
+            return -1;
+        }
         laststate = state;
         state = SECUREC_DECODE_STATE(ch, FMT_CHAR_TABLE, laststate);