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Warning: Undefined array key "user" in /home/admin/notification.mastermatka.com/subscribe.php on line 22

Fatal error: Uncaught TypeError: Kreait\Firebase\Messaging\Topic::fromValue(): Argument #1 ($value) must be of type string, null given, called in /home/admin/notification.mastermatka.com/kreait/vendor/kreait/firebase-php/src/Firebase/Messaging.php on line 122 and defined in /home/admin/notification.mastermatka.com/kreait/vendor/kreait/firebase-php/src/Firebase/Messaging/Topic.php:18 Stack trace: #0 /home/admin/notification.mastermatka.com/kreait/vendor/kreait/firebase-php/src/Firebase/Messaging.php(122): Kreait\Firebase\Messaging\Topic::fromValue(NULL) #1 /home/admin/notification.mastermatka.com/subscribe.php(23): Kreait\Firebase\Messaging->subscribeToTopics(Array, NULL) #2 {main} thrown in /home/admin/notification.mastermatka.com/kreait/vendor/kreait/firebase-php/src/Firebase/Messaging/Topic.php on line 18