diff --git a/ggml/src/ggml.c b/ggml/src/ggml.c
index a0769e098..3a0aff3fd 100644
--- a/ggml/src/ggml.c
+++ b/ggml/src/ggml.c
@@ -326,6 +326,8 @@ struct ggml_logger_state {
 static struct ggml_logger_state g_logger_state = {ggml_log_callback_default, NULL};
 
 static void ggml_log_internal_v(enum ggml_log_level level, const char * format, va_list args) {
+    if (format == NULL)
+	return;
     va_list args_copy;
     va_copy(args_copy, args);
     char buffer[128];