Zabbix 7.4.4 error in CGraphHelper widget

[DyingMuppet]

Hey Guys,

When I just updated my Ubuntu server with Zabbix 7.4.3 to Zabbix 7.4.4 I found an error on the CGraphHelper widget as below.

• Undefined array key "key_" [zabbix.php:17 → require_once() → ZBase->run() → ZBase->processRequest() → CController->run() → Widgets\SvgGraph\Actions\WidgetView->doAction() → Widgets\SvgGraph\Includes\CSvgGraphHelper::get() → CGraphHelper::calculateMetricsDelay() → CGraphHelper::getItemMaxDelay() in include/classes/helpers/CGraphHelper.php:306]
• preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated [zabbix.php:17 → require_once() → ZBase->run() → ZBase->processRequest() → CController->run() → Widgets\SvgGraph\Actions\WidgetView->doAction() → Widgets\SvgGraph\Includes\CSvgGraphHelper::get() → CGraphHelper::calculateMetricsDelay() → CGraphHelper::getItemMaxDelay() → preg_match() in include/classes/helpers/CGraphHelper.php:306]
• Undefined array key "key_" [zabbix.php:17 → require_once() → ZBase->run() → ZBase->processRequest() → CController->run() → Widgets\SvgGraph\Actions\WidgetView->doAction() → Widgets\SvgGraph\Includes\CSvgGraphHelper::get() → CGraphHelper::calculateMetricsDelay() → CGraphHelper::getItemMaxDelay() in include/classes/helpers/CGraphHelper.php:306]
• preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated [zabbix.php:17 → require_once() → ZBase->run() → ZBase->processRequest() → CController->run() → Widgets\SvgGraph\Actions\WidgetView->doAction() → Widgets\SvgGraph\Includes\CSvgGraphHelper::get() → CGraphHelper::calculateMetricsDelay() → CGraphHelper::getItemMaxDelay() → preg_match() in include/classes/helpers/CGraphHelper.php:306]

With a little help from GPT I changed the code of CGraphHelper.php between lines 305 and 306.

From:

/**
         * Returns the maximum item update interval based on the values of the "type" and "delay" fields.
         * Returns NULL if the item type does not support an update interval or if an error occurred during calculation.
         *
         * @param array  $item
         *
         * @return int|float|null
         */
        private static function getItemMaxDelay(array $item): int|float|null {
                if (($item['type'] == ITEM_TYPE_ZABBIX_ACTIVE && preg_match('/^(event)?log(rt)?\[/', $item['key_']))​

To:

 /**
         * Returns the maximum item update interval based on the values of the "type" and "delay" fields.
         * Returns NULL if the item type does not support an update interval or if an error occurred during calculation.
         *
         * @param array  $item
         *
         * @return int|float|null
         */
        private static function getItemMaxDelay(array $item): int|float|null {
                // Guard against empty or missing key_
                 if (!isset($item['key_']) || $item['key_'] === null || $item['key_'] === '') {
                     return 0; // of: continue; afhankelijk van de loop/verwachte semantics
                     }

                     // cast extra definition:
                     $subject = (string)$item['key_'];


                if (($item['type'] == ITEM_TYPE_ZABBIX_ACTIVE && preg_match('/^(event)?log(rt)?\[/', $subject, $m))​

This cleared the error for me on the webpage.
Hope this gives you enough feedback for a new minor version of the CGraphHelper.php

Regards!

[tjh]

Thanks, I'm seeing this error too. Have you logged a Zabbix bug report? If so can you link to it?
Kind Regards!

[sancho]

Hello, I have created a ticket on the Zabbix support system regarding the error and have informed them of your temporary solution.

Thank you very much DyingMuppet

https://support.zabbix.com/browse/ZBX-27166

[DyingMuppet]

Thanks guys, I didn't have the time to report it as a bug yet, so thank you a lot sancho

[sancho]

Hi,

After the update to 7.4.5 it seems that they had problems and have not added the fix for this bug and now with this version the problem is reproduced but the DyingMuppet solution does not work, here they have put another solution that should be the one they were going to upload:

Source: https://support.zabbix.com/browse/ZBX-27153

Fix: https://git.zabbix.com/projects/ZBX/...raphHelper.php

[cfrancis]

The error reappears when updating to 7.4.5; the same solution applies.

[JuergenM]

New versions supplied