Calling POS shopify.cart.setCustomer with a non-existing id leads to an uncaught exception in the native POS code. Example snippet: try { console.log("Calling setCustomer") await shopify.cart.setCustomer({ id: 1, }); } catch (e) { console.error("setCustomer exception caught") } In the…

It appears that setCustomer never resolves, even when called with an existing customer ID. Example snippet await shopify.cart.setCustomer({ id: numericId, // ID of an existing customer }); shopify.toast.show(`Customer set successfully`); The toast doesn’t pop up

Hi Galmis, thanks for flagging this. We’ll provide an update here once we’ve resolved that error. Regarding the issue where setCustomer doesn’t resolve, I wasn’t able to reproduce it. The promise resolves with undefined , the customer gets set to the cart, and the toast appears with this simple set…

Hi @Paige-Shopify Thanks for looking into this. Sorry for leaving some details out. The issue appears to be more subtle. Please see the snippet below. export function Example() { useEffect(() => { const unsubscribeScanner = shopify.scanner.scannerData.current.subscribe( async ({ data …

Thanks so much for the detailed context, exactly what we needed! Looks like there are a few issues here: Uncaught exception when Customer not found navigate.back doesn’t return a Promise Global state sharing no longer works Thanks for flagging these issues with us. We’re not able to provide an E…

Hello, @Paige-Shopify . I’m sorry to bother, but what’s the current status of this ticket? I’m experiencing another symptom of (what I think is) the same root cause - when navigating, a new runtime appears to be created, causing all sorts of weirdness. Example snippet below: function ExampleThree(…

@Galmis , apologies for the delay. These issues should now be resolved. Can you confirm if you’re still encountering any of the reported issues?

Sorry I should have been more specific. I was referring to the uncaught exception that occurs with shopify.cart.setCustomer when it’s passed a non-existent ID. Let me know if you’re still encountering issues with it.

No problem, @Paige-Shopify . All of the issues listed in this ticket (including the setCustomer one) are symptoms of the new navigation model. After rewriting some parts of my POS extensions, all of the listed issues went away. Having something along the lines of “in pre 2025-10, your extension and…

Oh I see! Thanks for sharing what you found and what worked. I agree it would be useful to have the change in mounting behavior called out in the docs, and it looks like JS_Goupil is already on it :slight_smile:

The new POS navigation API is unusable

Extensions

Galmis May 5, 2026, 2:02pm 8

Hi @Paige-Shopify.

No problem. Apparently, this is all by design, just not documented. I’m happy to close this.

Topic		Replies	Views
Need navigation history replace OR back-arrow override on <s-page> Extensions pos-extensions	6	122	May 5, 2026
Navigation api bricked with the new ios app update v10.19.x Extensions pos-extensions	6	150	February 6, 2026
APIs unavailable from the shopify global for pos.purchase.post.block.render target Extensions pos-extensions	4	149	November 10, 2025
Navigation API isn't working on POS UI Extension 2025-10 version Extensions pos-extensions	2	98	November 12, 2025
POS UI Extension - Navigate to Cart page Extensions pos-extensions	6	256	January 15, 2026

The new POS navigation API is unusable

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