ngx_lua_version check error when using stream

[supernev]

Version: openresty 1.13.6.2
Error:
/usr/local/openresty/lualib/resty/mysql.lua:31: ngx_lua 0.9.11+ required
Description:
In /usr/local/openresty/lualib/resty/core/base.lua line 25, resty set ngx.config.ngx_lua_version to ngx_stream_lua_module version 5.

How to fix:
Should only check ngx_lua_version < 9011 when subsystem=="http".