Error (#8)

yii\base\ErrorException: Trying to get property 't_id' of non-object in /home3/baltroto/public_html/controllers/frontend/ProductController.php:104
Stack trace:
#0 /home3/baltroto/public_html/controllers/frontend/ProductController.php(104): yii\base\ErrorHandler->handleError(8, 'Trying to get p...', '/home3/baltroto...', 104, Array)
#1 [internal function]: app\controllers\frontend\ProductController->actionSingleproduct()
#2 /home3/baltroto/public_html/vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array(Array, Array)
#3 /home3/baltroto/public_html/vendor/yiisoft/yii2/base/Controller.php(178): yii\base\InlineAction->runWithParams(Array)
#4 /home3/baltroto/public_html/vendor/yiisoft/yii2/base/Module.php(552): yii\base\Controller->runAction('singleproduct', Array)
#5 /home3/baltroto/public_html/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction('frontend/produc...', Array)
#6 /home3/baltroto/public_html/vendor/yiisoft/yii2/base/Application.php(384): yii\web\Application->handleRequest(Object(yii\web\Request))
#7 /home3/baltroto/public_html/web/index.php(13): yii\base\Application->run()
#8 {main}