[2019-08-14 05:29:12] production.ERROR: Call to a member function toDateString() on null {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\FatalThrowableError(code: 0): Call to a member function toDateString() on null at /home/edubearsbf/bs/lessons/app/Mails/LessonSupervisorSummaryMail.php:203)
[stacktrace]
#0 [internal function]: App\\Mails\\LessonSupervisorSummaryMail->App\\Mails\\{closure}(Object(App\\Models\\DiscussedSchool), 0)
#1 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Support/Collection.php(1064): array_map(Object(Closure), Array, Array)
#2 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Collection.php(254): Illuminate\\Support\\Collection->map(Object(Closure))
#3 /home/edubearsbf/bs/lessons/app/Mails/LessonSupervisorSummaryMail.php(206): Illuminate\\Database\\Eloquent\\Collection->map(Object(Closure))
#4 /home/edubearsbf/bs/lessons/app/Mails/LessonSupervisorSummaryMail.php(43): App\\Mails\\LessonSupervisorSummaryMail->getStandards(Object(Illuminate\\Support\\Collection))
#5 [internal function]: App\\Mails\\LessonSupervisorSummaryMail->App\\Mails\\{closure}(Object(Illuminate\\Support\\Collection), 12)
#6 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Support/Collection.php(1064): array_map(Object(Closure), Array, Array)
#7 /home/edubearsbf/bs/lessons/app/Mails/LessonSupervisorSummaryMail.php(47): Illuminate\\Support\\Collection->map(Object(Closure))
#8 /home/edubearsbf/bs/lessons/app/Services/EmailService.php(302): App\\Mails\\LessonSupervisorSummaryMail->__construct(Object(Illuminate\\Support\\Collection))
#9 /home/edubearsbf/bs/lessons/app/Console/Commands/DailyMails.php(57): App\\Services\\EmailService->sendLessonSupervisorSummary()
#10 [internal function]: App\\Console\\Commands\\DailyMails->handle()
#11 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(32): call_user_func_array(Array, Array)
#12 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(90): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#13 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(34): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Illuminate\\Foundation\\Application), Array, Object(Closure))
#14 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Container/Container.php(580): Illuminate\\Container\\BoundMethod::call(Object(Illuminate\\Foundation\\Application), Array, Array, NULL)
#15 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Console/Command.php(183): Illuminate\\Container\\Container->call(Array)
#16 /home/edubearsbf/bs/lessons/vendor/symfony/console/Command/Command.php(255): Illuminate\\Console\\Command->execute(Object(Symfony\\Component\\Console\\Input\\StringInput), Object(Illuminate\\Console\\OutputStyle))
#17 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Console/Command.php(170): Symfony\\Component\\Console\\Command\\Command->run(Object(Symfony\\Component\\Console\\Input\\StringInput), Object(Illuminate\\Console\\OutputStyle))
#18 /home/edubearsbf/bs/lessons/vendor/symfony/console/Application.php(908): Illuminate\\Console\\Command->run(Object(Symfony\\Component\\Console\\Input\\StringInput), Object(Symfony\\Component\\Console\\Output\\BufferedOutput))
#19 /home/edubearsbf/bs/lessons/vendor/symfony/console/Application.php(269): Symfony\\Component\\Console\\Application->doRunCommand(Object(App\\Console\\Commands\\DailyMails), Object(Symfony\\Component\\Console\\Input\\StringInput), Object(Symfony\\Component\\Console\\Output\\BufferedOutput))
#20 /home/edubearsbf/bs/lessons/vendor/symfony/console/Application.php(145): Symfony\\Component\\Console\\Application->doRun(Object(Symfony\\Component\\Console\\Input\\StringInput), Object(Symfony\\Component\\Console\\Output\\BufferedOutput))
#21 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Console/Application.php(90): Symfony\\Component\\Console\\Application->run(Object(Symfony\\Component\\Console\\Input\\StringInput), Object(Symfony\\Component\\Console\\Output\\BufferedOutput))
#22 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Console/Application.php(182): Illuminate\\Console\\Application->run(Object(Symfony\\Component\\Console\\Input\\StringInput), Object(Symfony\\Component\\Console\\Output\\BufferedOutput))
#23 /home/edubearsbf/bs/lessons/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(264): Illuminate\\Console\\Application->call('tasks:daily-mai...', Array, NULL)
#24 /home/edubearsbf/bs/lessons/cron/DailyMails.php(8): Illuminate\\Foundation\\Console\\Kernel->call('tasks:daily-mai...')
#25 {main}
"}