ERROR: Undefined offset: 1 when run queue:work

[agolovenkin]

• Laravel Version: 5.6.15
• PHP Version: 7.2.3-1
• QUEUE_DRIVER=redis
• Redis driver: phpredis
• Redis: 4.0.7

Description:

After run php artisan queue:work I see the following error every 7 seconds in my log:

[2018-03-30 19:13:53] local.ERROR: Undefined offset: 1 {"exception":"[object] (ErrorException(code: 0): Undefined offset: 1 at /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/RedisQueue.php:233)
[stacktrace]
#0 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/RedisQueue.php(233): Illuminate\\Foundation\\Bootstrap\\HandleExceptions->handleError(8, 'Undefined offse...', '/home/...', 233, Array)
#1 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/RedisQueue.php(213): Illuminate\\Queue\\RedisQueue->blockingPop('queues:default')
#2 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/RedisQueue.php(165): Illuminate\\Queue\\RedisQueue->retrieveNextJob('queues:default')
#3 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/Worker.php(246): Illuminate\\Queue\\RedisQueue->pop('default')
#4 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/Worker.php(107): Illuminate\\Queue\\Worker->getNextJob(Object(Illuminate\\Queue\\RedisQueue), 'default')
#5 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/Console/WorkCommand.php(101): Illuminate\\Queue\\Worker->daemon('redis', 'default', Object(Illuminate\\Queue\\WorkerOptions))
#6 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Queue/Console/WorkCommand.php(85): Illuminate\\Queue\\Console\\WorkCommand->runWorker('redis', 'default')
#7 [internal function]: Illuminate\\Queue\\Console\\WorkCommand->handle()
#8 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(29): call_user_func_array(Array, Array)
#9 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(87): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#10 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(31): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Illuminate\\Foundation\\Application), Array, Object(Closure))
#11 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Container/Container.php(564): Illuminate\\Container\\BoundMethod::call(Object(Illuminate\\Foundation\\Application), Array, Array, NULL)
#12 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Console/Command.php(183): Illuminate\\Container\\Container->call(Array)
#13 /home/workplace/api/vendor/symfony/console/Command/Command.php(252): Illuminate\\Console\\Command->execute(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Illuminate\\Console\\OutputStyle))
#14 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Console/Command.php(170): Symfony\\Component\\Console\\Command\\Command->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Illuminate\\Console\\Outpu
tStyle))
#15 /home/workplace/api/vendor/symfony/console/Application.php(865): Illuminate\\Console\\Command->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#16 /home/workplace/api/vendor/symfony/console/Application.php(241): Symfony\\Component\\Console\\Application->doRunCommand(Object(Illuminate\\Queue\\Console\\WorkCommand), Object(Symfony\\Component\\Console\\Input\\ArgvInput), O
bject(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#17 /home/workplace/api/vendor/symfony/console/Application.php(143): Symfony\\Component\\Console\\Application->doRun(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput
))
#18 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Console/Application.php(88): Symfony\\Component\\Console\\Application->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\
\Output\\ConsoleOutput))
#19 /home/workplace/api/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(122): Illuminate\\Console\\Application->run(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\
Output\\ConsoleOutput))
#20 /home/workplace/api/artisan(37): Illuminate\\Foundation\\Console\\Kernel->handle(Object(Symfony\\Component\\Console\\Input\\ArgvInput), Object(Symfony\\Component\\Console\\Output\\ConsoleOutput))
#21 {main}
"}

It does not affect worker but looks ugly.

[pdavide]

Hi, I experienced the same bug.
It does not affect worker but it can pollute you log files.
I think it can be easily fixed changing ! is_null() to ! empty() here.
As you can see in this phpredis test an empty array (not a null value) is returned if no elements are found in the list.
I'll write a simple PR asap.