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I really don't want to see error messages being displayed to my clients linking them back to the WHMCS documentation. Does anyone know how to stop that from happening? i.e to display a generic message without the debug info? I've looked through the settings inside WHMCS and I don't believe I have anything set up to show the full PHP error / stack trace to the client . Maybe I'm wrong there? I don't have General Settings > Other > Display Errors enabled. To re-create this problem, you only need to do something as simple as this... 1. Masquerade as a client by clicking the "Login as Client" option from within the WHMCS admin area. 2. Edit the clients profile details changing the first letter of their Email address to uppercase - i.e if their Email address was john.smith@blah.com - change it to John.smith@blah.com 3. Try to submit the changes - you will get this.... Oops! Something went wrong and we couldn't process your request. Please go back to the previous page and try again. If the problem persists, please contact us. Back to Homepage For additional assistance, please reference the WHMCS TroubleShooting Guide » WHMCS\Exception\Model\UniqueConstraint: A "WHMCS\User\Client" record with "email" value "John.smith@blah.com" already exists. in /home/username/public_html/clients/vendor/whmcs/whmcs-foundation/lib/Model/Observer.php:0 Stack trace: #0 /home/username/public_html/clients/vendor/whmcs/whmcs-foundation/lib/Model/Observer.php(0): WHMCS\Model\Observer->enforceUniqueConstraint(Object(WHMCS\User\Client)) #1 [internal function]: WHMCS\Model\Observer->updating(Object(WHMCS\User\Client)) #2 /home/username/public_html/clients/vendor/illuminate/events/Dispatcher.php(347): call_user_func_array(Array, Array) #3 [internal function]: Illuminate\Events\Dispatcher->Illuminate\Events\{closure}(Object(WHMCS\User\Client)) #4 /home/username/public_html/clients/vendor/illuminate/events/Dispatcher.php(221): call_user_func_array(Object(Closure), Array) #5 /home/username/public_html/clients/vendor/illuminate/events/Dispatcher.php(164): Illuminate\Events\Dispatcher->fire('eloquent.updati...', Array, true) #6 /home/username/public_html/clients/vendor/illuminate/database/Eloquent/Model.php(1675): Illuminate\Events\Dispatcher->until('eloquent.updati...', Object(WHMCS\User\Client)) #7 /home/username/public_html/clients/vendor/illuminate/database/Eloquent/Model.php(1534): Illuminate\Database\Eloquent\Model->fireModelEvent('eloquent.updati...') #8 /home/username/public_html/clients/vendor/illuminate/database/Eloquent/Model.php(1470): Illuminate\Database\Eloquent\Model->performUpdate(Object(Illuminate\Database\Eloquent\Builder), Array) #9 /home/username/public_html/clients/vendor/whmcs/whmcs-foundation/lib/Client.php(0): Illuminate\Database\Eloquent\Model->save() #10 /home/username/public_html/clients/clientarea.php(0): WHMCS\Client->updateClient() #11 {main}