I'm not sure if thi sis just me or if it has been reported before.
If you send a non existing tag id to utag.view/link/track , the library will thrown an error
VM7081 utag.js:317 Uncaught TypeError: Cannot read properties of undefined (reading 'send')
I've been able to replicate this on the following lib versions (at least);
This is expected because the tag doesn't exist. If you'd like to see more error handling or some sort of console output instead, you can submit a product idea to our engineering team to add that to our product. To submit a product idea, click on the "Resource Center" link within the Tealium product and then click on "Submit Your Idea".