diff --git a/frameworks/libhilog/vsnprintf/output_p.inl b/frameworks/libhilog/vsnprintf/output_p.inl
index 06a14fc21332aa57ccf62dcbf3ed814229d8f0fb..29ddf8653bd6958cf903130a04a5d006221f7a71 100644
--- a/frameworks/libhilog/vsnprintf/output_p.inl
+++ b/frameworks/libhilog/vsnprintf/output_p.inl
@@ -496,6 +496,9 @@ 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);