Notice: Trying to get property 'id' of non-object Topic is solved

[TheAnt]

Hello
I need to test locally my J! 3.10.11 site before to update it to J! 4. I'm on Mac using MAMP Free.
I copied files and db and configurated configuration.php file, the frontend is loading almost fine.
The problem is that in backend I can't login (using the correct username/password of course). I get this alert:

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Notice: Trying to get property 'id' of non-object in /Applications/MAMP/htdocs/site/libraries/src/Access/Access.php on line 454

on line 454 ther is this code:

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		// Now create save the components asset tree to preload memory.
		foreach ($assets as $asset)
		{
			if (!isset(self::$assetPermissionsParentIdMapping[$asset->name]))
			{
				self::$assetPermissionsParentIdMapping[$asset->name] = array($rootAsset->id => $rootAsset, $asset->id => $asset);
				self::$preloadedAssets[$asset->id]                   = $asset->name;
			}
		}

the only difference from production server is the Php version: 7.1.33 online, 7.4.33 locally.
I can choose 7.1.33 in MAMP.

Any suggestion to fix the login problem?
I already tried to change username and password via PhpMyAdmin.

[toivo]

Edit the file configuration.php in the main Joomla folder to get rid of PHP notices:

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	public $error_reporting = 'simple';

The recommended setting for live sites:

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[code]	public $error_reporting = 'none;

The minimum PHP version for Joomla 4 is PHP 7.2.5. Older versions are not guaranteeds to work.

The recommended version of PHP for Joomla 4 and Joomla 5 is PHP 8.2. The test environment should use PHP 8.1 as the minimum version so that incompatible third party extensions can be uninstalled and replaced before your host removes unsupported versions of PHP.

[TheAnt]

Thank you Toivo but the problem was the login failure, not the notice and this is a Joomla 3 site.
I disabled some extensions via phpMyadmin and the login worked.
Now I can upgrade php and Joomla.