diff --git a/test/DumpDatabase.cxx b/test/DumpDatabase.cxx
index ec7de7e45..14bb4ba14 100644
--- a/test/DumpDatabase.cxx
+++ b/test/DumpDatabase.cxx
@@ -99,7 +99,7 @@ main(int argc, char **argv)
 	/* do it */
 
 	const struct config_param *path = config_get_param(CONF_DB_FILE);
-	config_param param("database", path->line);
+	config_param param("database", path != nullptr ? path->line : -1);
 	if (path != nullptr)
 		param.AddBlockParam("path", path->value.c_str(), path->line);