Issue page is empty when custom plugin is enabled

I am trying to develop my custom plugin to modify the issue view page. After I implemented the functionality, I have found out that issue views are completely empty and log files only contain some warnings, which are not related to my plugin.

When viewing all issues in the project, the issue view is loaded just fine and the header of my plugin is displayed as expected. The plugin is supposed to add a web-panel to the right context of the issue view, and when trying to view a single issue, only div tags generated by the plugin are displayed. I have some exception in web developer tools in my browser, could it somehow be relevant to the problem?

could it somehow be relevant to the problem?

You can uninstall the plugin and see if the page works without it.

I have some exception in web developer tools in my browser,

Please share the exact error