Error ".maps is not a function" after update 3.0.4

Hi!

After updating to 3.0.4 maps are not showing and console shows error “$(…).maps is not a function”. Maps.js seems to be linked correctly in the sourcecode, so what could be the issue?

I tried to deactivate an activate the plugin, but it didn’t solve this issue.

Thank you if you can help.

https://ww.wp.xz.cn/plugins/wp-google-map-plugin/