diff --git a/src/crypto/tls_openssl.c b/src/crypto/tls_openssl.c
index 4cfa5f4..64a20ce 100644
--- a/src/crypto/tls_openssl.c
+++ b/src/crypto/tls_openssl.c
@@ -1373,6 +1373,9 @@
 	const char *err_str;
 
 	err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
+	if (!err_cert)
+		return 0;
+
 	err = X509_STORE_CTX_get_error(x509_ctx);
 	depth = X509_STORE_CTX_get_error_depth(x509_ctx);
 	ssl = X509_STORE_CTX_get_ex_data(x509_ctx,