When I attempt a basic http post, I can see that the server is returning a normal 400. But the client seems to just crash with an error I can’t make sense of. I have the following code

I have a text field to search for cities.
When I type a character, a request is sent to the server (API). When I enter any character.
I need to cancel the previous request that is pending.
Please help dear professionals, Thank you).
I can’t cancel my previous request