When you call the component, the page stops working
There must be some other issue on your page, as it is working perfectly fine here.
Please provide a link to this page, where we can check this issue.
I have faced the same error on console when using session. It occurs when ‘null’ values get set in the session variable.
Although, I have not seen the behaviour where the component does not show up in the UI, but is present in the code view.
Did you try adding it again after re-opening the page in question or restarting Wappler itself? There seems to be some error on the page too as shown in the top right corner of the design view.
Also, is this a content page in a SPA… or just a regular page?