Can you try with 2.0.2, I fixed that undefined crash. I am not really familiar with how this plugin works so make sure you fill out the necessary info in the ACP page.
For example the plugin seems to look for the email in profile.mail but if there is an email_field set in the acp config then it will try to get the email from there.
Solved How to update a plugin?
In my NodeBB admin area the latest version of nodebb-plugin-imgur is 0.1.4. However, looking at the GitHub repo, version 1.0.0 was released 5 days ago. It doesn't give me the option to update the plugin in the admin area. How else can I update to version 1.0.0?
npm update nodebb-plugin-imgurwill install the latest version from npm. Do remember that when you do this with any plugin, you won't get the compatibility warnings if the plugin is not compatible with your NodeBB version.
The ACP page should show the latest version now.