yii\base\ErrorException#1
(
    [*:message] => 'Attempt to read property \"product\" on null'
    [Exception:string] => ''
    [*:code] => 2
    [*:file] => '/var/www/html/david/modules/shop/models/Product.php'
    [*:line] => 601
    [Exception:trace] => [
        0 => [
            'file' => '/var/www/html/david/modules/shop/models/Product.php'
            'line' => 601
            'function' => 'handleError'
            'class' => 'yii\\base\\ErrorHandler'
            'type' => '->'
        ]
        1 => [
            'file' => '/var/www/html/david/modules/shop/views/shop/_product.php'
            'line' => 52
            'function' => 'getMainPrice'
            'class' => 'app\\modules\\shop\\models\\Product'
            'type' => '->'
        ]
        2 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/View.php'
            'line' => 348
            'args' => [
                0 => '/var/www/html/david/modules/shop/views/shop/_product.php'
            ]
            'function' => 'require'
        ]
        3 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/View.php'
            'line' => 258
            'function' => 'renderPhpFile'
            'class' => 'yii\\base\\View'
            'type' => '->'
        ]
        4 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/View.php'
            'line' => 157
            'function' => 'renderFile'
            'class' => 'yii\\base\\View'
            'type' => '->'
        ]
        5 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/widgets/ListView.php'
            'line' => 191
            'function' => 'render'
            'class' => 'yii\\base\\View'
            'type' => '->'
        ]
        6 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/widgets/ListView.php'
            'line' => 124
            'function' => 'renderItem'
            'class' => 'yii\\widgets\\ListView'
            'type' => '->'
        ]
        7 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/widgets/BaseListView.php'
            'line' => 160
            'function' => 'renderItems'
            'class' => 'yii\\widgets\\ListView'
            'type' => '->'
        ]
        8 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/widgets/BaseListView.php'
            'line' => 135
            'function' => 'renderSection'
            'class' => 'yii\\widgets\\BaseListView'
            'type' => '->'
        ]
        9 => [
            'function' => 'yii\\widgets\\{closure}'
            'class' => 'yii\\widgets\\BaseListView'
            'type' => '->'
        ]
        10 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/widgets/BaseListView.php'
            'line' => 138
            'function' => 'preg_replace_callback'
        ]
        11 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/Widget.php'
            'line' => 146
            'function' => 'run'
            'class' => 'yii\\widgets\\BaseListView'
            'type' => '->'
        ]
        12 => [
            'file' => '/var/www/html/david/modules/shop/views/shop/collections.php'
            'line' => 167
            'function' => 'widget'
            'class' => 'yii\\base\\Widget'
            'type' => '::'
        ]
        13 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/View.php'
            'line' => 348
            'args' => [
                0 => '/var/www/html/david/modules/shop/views/shop/collections.php'
            ]
            'function' => 'require'
        ]
        14 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/View.php'
            'line' => 258
            'function' => 'renderPhpFile'
            'class' => 'yii\\base\\View'
            'type' => '->'
        ]
        15 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/View.php'
            'line' => 157
            'function' => 'renderFile'
            'class' => 'yii\\base\\View'
            'type' => '->'
        ]
        16 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/Controller.php'
            'line' => 407
            'function' => 'render'
            'class' => 'yii\\base\\View'
            'type' => '->'
        ]
        17 => [
            'file' => '/var/www/html/david/modules/shop/controllers/ShopController.php'
            'line' => 540
            'function' => 'render'
            'class' => 'yii\\base\\Controller'
            'type' => '->'
        ]
        18 => [
            'function' => 'actionCollections'
            'class' => 'app\\modules\\shop\\controllers\\ShopController'
            'type' => '->'
        ]
        19 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/InlineAction.php'
            'line' => 57
            'function' => 'call_user_func_array'
        ]
        20 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/Controller.php'
            'line' => 178
            'function' => 'runWithParams'
            'class' => 'yii\\base\\InlineAction'
            'type' => '->'
        ]
        21 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/Module.php'
            'line' => 552
            'function' => 'runAction'
            'class' => 'yii\\base\\Controller'
            'type' => '->'
        ]
        22 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/web/Application.php'
            'line' => 103
            'function' => 'runAction'
            'class' => 'yii\\base\\Module'
            'type' => '->'
        ]
        23 => [
            'file' => '/var/www/html/david/vendor/yiisoft/yii2/base/Application.php'
            'line' => 384
            'function' => 'handleRequest'
            'class' => 'yii\\web\\Application'
            'type' => '->'
        ]
        24 => [
            'file' => '/var/www/html/david/web/index.php'
            'line' => 13
            'function' => 'run'
            'class' => 'yii\\base\\Application'
            'type' => '->'
        ]
    ]
    [Exception:previous] => null
    [*:severity] => 2
)