(Amr)

Any update on this ?

Unfortunately, the error happens before any hook is triggered, so no way to fix it on my end.

I have reported the following on 19th Feb 2026 : == Affected Version == WHMCS 9.0.1 == Description == When a client attempts to upgrade an existing yearly/recurring service to a one-time (lifetime) service, WHMCS throws a fatal DivisionByZeroError in includes/upgradefunctions.php inside SumUpPackageUpgradeOrder(). This happens on the latest WHMCS version running on PHP 8.3 and occurs even with all custom hooks/modules disabled, indicating a core issue. This was working fine with PHP 7.4 ex : Error: DivisionByZeroError: Division by zero in public_html/includes/upgradefunctions.php:0 Stack trace: #0 public_html/upgrade.php(0): SumUpPackageUpgradeOrder('9043', 10, 'monthly', '') #1 {main} == Steps to Reproduce == Use the latest WHMCS version on PHP 8.3. Create a recurring product (e.g., yearly billing cycle). Create a second product with pay type “One Time”. Set up an upgrade path from the yearly product to the one-time product. Log in as a client with the yearly service. Go to Client Area ? Upgrade/Downgrade and attempt to upgrade to the one-time product. The upgrade page fails with a fatal error. == Expected Result == The upgrade page should load normally == PHP Version == 8.3 == Severity == High This was confirmed to be a bug [ case WHMCS-25204 ]. Since then, two minor versions (WHMCS v9.0.2 & v9.0.3) were released, and this is not fixed yet!

Just a quick update, today we released Lara v9.0.1, which is fully compatible with WHMCS v9.0.1.

Just a quick update, today we released Lara v9.0.0, which is fully compatible with WHMCS v9.0.0.

Today we have released Lara updates for all actively supported and long-term support (LTS) versions of WHMCS, namely: * Lara v8.13.1 (for WHMCS v8.13.1). * Lara v8.12.2 (for WHMCS v8.12.2). * Lara v8.11.3 (for WHMCS v8.11.3). These updates resolve a number of security vulnerabilities that have been identified as affecting all currently supported versions of WHMCS. We strongly recommend that you update your WHMCS as soon as possible, then update the Lara Theme.

Just a quick update, today we released Lara v8.13.0, which is fully compatible with WHMCS v8.13.0 and PHP v8.3.

Just a quick update, today we released Lara v8.12.0, which is fully compatible with WHMCS v8.12.0 (released few days ago!).

At this moment, the delivery report is not available in the ticket list as indicated in your description. We appreciate your suggestion and will consider it for potential future developments.

Just a quick update .. today we release Lara AI v1.2.1, which is compatible with PHP v7.4 to v8.3 .. enjoy 🙂 Grab your free copy today and give it a try !

We have just released v1.0.2, which is fully compatible with WHMCS v8.11.0 and PHP v8.2.

We have just released v1.0.2, which is fully compatible with WHMCS v8.11.0 and PHP v8.2.

We have just released Lara v8.11.0, which is fully compatible with WHMCS v8.11.0 and PHP v8.2.

Just a quick update, today we released Lara v8.10.1, which is fully compatible with WHMCS v8.10.1 (released yesterday!).

Just a quick update, today we released Lara v8.9.0, which is fully compatible with WHMCS v8.9.0 (released few days ago!).