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-rw-r--r--apps/openssl.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/apps/openssl.c b/apps/openssl.c
index 31f598815a..769555e5e1 100644
--- a/apps/openssl.c
+++ b/apps/openssl.c
@@ -113,7 +113,8 @@ static size_t internal_trace_cb(const char *buf, size_t cnt,
tid = CRYPTO_THREAD_get_current_id();
hex = OPENSSL_buf2hexstr((const unsigned char *)&tid, sizeof(tid));
BIO_snprintf(buffer, sizeof(buffer), "TRACE[%s]:%s: ",
- hex, OSSL_trace_get_category_name(category));
+ hex == NULL ? "<null>" : hex,
+ OSSL_trace_get_category_name(category));
OPENSSL_free(hex);
BIO_ctrl(trace_data->bio, PREFIX_CTRL_SET_PREFIX,
strlen(buffer), buffer);