Error: Call to a member function file_get_contents() on null in .../lib/private/Files/Filesystem.php:719

[newhinton]

Hello Dev, ive encountered an Error which i cant solve on my own.
Im using Nextcloud 11.0.2 and php 7.0.8-0ubuntu0.16.04.3 with apache2 as the webserver.

When i start your tool from my terminal, it runs for a few seconds (no outputs are made to the console so im assuming it does at least something), and then it throws an exception. CPU usage is slightly higher than normal.

Thanks for your help, and if i can assist you further, feel free to ask!

Sorry for the missreferences, my log contained hashtags, which function i didnt knew...
The stacktrace:

An unhandled exception has been thrown:
Error: Call to a member function file_get_contents() on null in /var/www/mycloud/lib/private/Files/Filesystem.php:719
Stack trace:
0 /var/www/mycloud/lib/private/legacy/image.php(597): OC\Files\Filesystem::file_get_contents('/var/www/myclou...')
1 /var/www/mycloud/lib/private/Preview/MP3.php(80): OC_Image->loadFromFile('/var/www/myclou...')
2 /var/www/mycloud/lib/private/Preview/MP3.php(64): OC\Preview\MP3->getNoCoverThumbnail()
3 /var/www/mycloud/lib/private/Preview/GeneratorHelper.php(54): OC\Preview\MP3->getThumbnail('/files_trashbin...', 256, 256, false, Object(OC\Files\View))
4 /var/www/mycloud/lib/private/Preview/Generator.php(155): OC\Preview\GeneratorHelper->getThumbnail(Object(OC\Preview\MP3), Object(OC\Files\Node\File), 256, 256)
5 /var/www/mycloud/lib/private/Preview/Generator.php(108): OC\Preview\Generator->getMaxPreview(Object(OC\Files\SimpleFS\SimpleFolder), Object(OC\Files\Node\File), 'audio/mpeg')
6 /var/www/mycloud/lib/private/PreviewManager.php(182): OC\Preview\Generator->getPreview(Object(OC\Files\Node\File), 32, 32, true, 'fill', 'audio/mpeg')
7 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(158): OC\PreviewManager->getPreview(Object(OC\Files\Node\File), 32, 32, true)
8 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(181): OCA\PreviewGenerator\Command\PreGenerate->processFile(Object(OC\Files\Node\File))
9 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
10 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
11 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
12 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
13 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
14 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
15 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
16 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(150): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
17 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(113): OCA\PreviewGenerator\Command\PreGenerate->processRow(Array)
18 /var/www/mycloud/apps/previewgenerator/lib/Command/PreGenerate.php(91): OCA\PreviewGenerator\Command\PreGenerate->startProcessing()
19 /var/www/mycloud/3rdparty/symfony/console/Command/Command.php(256): OCA\PreviewGenerator\Command\PreGenerate->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
20 /var/www/mycloud/3rdparty/symfony/console/Application.php(818): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
21 /var/www/mycloud/3rdparty/symfony/console/Application.php(186): Symfony\Component\Console\Application->doRunCommand(Object(OCA\PreviewGenerator\Command\PreGenerate), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
22 /var/www/mycloud/3rdparty/symfony/console/Application.php(117): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
23 /var/www/mycloud/lib/private/Console/Application.php(169): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
24 /var/www/mycloud/console.php(90): OC\Console\Application->run()
25 /var/www/mycloud/occ(11): require_once('/var/www/myclou...')

[Tamsy]

Why is this issue is closed?
We are getting the exact same error on Nextcloud 11.0.1 with Preview Generator 1.0.1 and Gallery 16.0.0.

[moretocome]

Same issue. Nextcloud 11.0.1 on Raspberry Pi 3 with latest Raspbian.
PHP version 7.0.14, MariaDB version 10.0.29. Gallery app verion 16.0.0 and Preview Generator app version 1.0.1.

[Iturbide]

Same problem: nexcloud 11.02RC2 on Ubuntu trusty tahr

[sebastianmonzel]

Same here. 11.0.2RC1 with raspbian.

[Dennis14e]

Any update on this? Same problem \w Nextcloud 11.0.2 (stable).
PHP 7.1.2, MariaDB 10.0.29, Gallery 16.0.0, Preview Generator 1.0.1

[pieter-groeneweg]

same here:

An unhandled exception has been thrown:
Error: Call to a member function file_get_contents() on null in /home/share/public_html/lib/private/Files/Filesystem.php:719
Stack trace:
#0 /home/share/public_html/lib/private/legacy/image.php(597): OC\Files\Filesystem::file_get_contents('/home/share/pub...')
#1 /home/share/public_html/lib/private/Preview/MP3.php(80): OC_Image->loadFromFile('/home/share/pub...')
#2 /home/share/public_html/lib/private/Preview/MP3.php(64): OC\Preview\MP3->getNoCoverThumbnail()
#3 /home/share/public_html/lib/private/Preview/GeneratorHelper.php(54): OC\Preview\MP3->getThumbnail('/files/document...', 2048, 2048, false, Object(OC\Files\View))
#4 /home/share/public_html/lib/private/Preview/Generator.php(155): OC\Preview\GeneratorHelper->getThumbnail(Object(OC\Preview\MP3), Object(OC\Files\Node\File), 2048, 2048)
#5 /home/share/public_html/lib/private/Preview/Generator.php(108): OC\Preview\Generator->getMaxPreview(Object(OC\Files\SimpleFS\SimpleFolder), Object(OC\Files\Node\File), 'audio/mpeg')
#6 /home/share/public_html/lib/private/PreviewManager.php(182): OC\Preview\Generator->getPreview(Object(OC\Files\Node\File), 32, 32, true, 'fill', 'audio/mpeg')
#7 /home/share/public_html/apps/previewgenerator/lib/Command/PreGenerate.php(158): OC\PreviewManager->getPreview(Object(OC\Files\Node\File), 32, 32, true)
#8 /home/share/public_html/apps/previewgenerator/lib/Command/PreGenerate.php(181): OCA\PreviewGenerator\Command\PreGenerate->processFile(Object(OC\Files\Node\File))
#9 /home/share/public_html/apps/previewgenerator/lib/Command/PreGenerate.php(183): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
#10 /home/share/public_html/apps/previewgenerator/lib/Command/PreGenerate.php(150): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder))
#11 /home/share/public_html/apps/previewgenerator/lib/Command/PreGenerate.php(113): OCA\PreviewGenerator\Command\PreGenerate->processRow(Array)
#12 /home/share/public_html/apps/previewgenerator/lib/Command/PreGenerate.php(91): OCA\PreviewGenerator\Command\PreGenerate->startProcessing()
#13 /home/share/public_html/3rdparty/symfony/console/Command/Command.php(256): OCA\PreviewGenerator\Command\PreGenerate->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#14 /home/share/public_html/3rdparty/symfony/console/Application.php(818): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#15 /home/share/public_html/3rdparty/symfony/console/Application.php(186): Symfony\Component\Console\Application->doRunCommand(Object(OCA\PreviewGenerator\Command\PreGenerate), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#16 /home/share/public_html/3rdparty/symfony/console/Application.php(117): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#17 /home/share/public_html/lib/private/Console/Application.php(169): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#18 /home/share/public_html/console.php(90): OC\Console\Application->run()
#19 /home/share/public_html/occ(11): require_once('/home/share/pub...')
#20 {main}

on a Pi3, PHP7, data folder outside the root on /mnt/.....

[umgfoin]

And, same here:
nextcloud 11.0.2.7
Preview Generator 1.0.2

php 7.1
centos 6.8

An unhandled exception has been thrown: Error: Call to a member function file_get_contents() on null in /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/Files/Filesystem.php:719 Stack trace: #0 /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/legacy/image.php(597): OC\Files\Filesystem::file_get_contents('/home/samba/aeg...') #1 /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/Preview/Image.php(57): OC_Image->loadFromFile('/home/smb_extern/tad...') #2 /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/Preview/GeneratorHelper.php(54): OC\Preview\Image->getThumbnail('/files/AEGAEON/...', 2048, 2048, false, Object(OC\Files\View)) #3 /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/Preview/Generator.php(155): OC\Preview\GeneratorHelper->getThumbnail(Object(OC\Preview\BMP), Object(OC\Files\Node\File), 2048, 2048) #4 /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/Preview/Generator.php(108): OC\Preview\Generator->getMaxPreview(Object(OC\Files\SimpleFS\SimpleFolder), Object(OC\Files\Node\File), 'image/bmp') #5 /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/PreviewManager.php(182): OC\Preview\Generator->getPreview(Object(OC\Files\Node\File), 32, 32, true, 'fill', 'image/bmp') #6 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(170): OC\PreviewManager->getPreview(Object(OC\Files\Node\File), 32, 32, true) #7 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(197): OCA\PreviewGenerator\Command\PreGenerate->processFile(Object(OC\Files\Node\File)) #8 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(199): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder)) #9 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(199): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder)) #10 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(199): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder)) #11 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(199): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder)) #12 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(158): OCA\PreviewGenerator\Command\PreGenerate->processFolder(Object(OC\Files\Node\Folder)) #13 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(127): OCA\PreviewGenerator\Command\PreGenerate->processRow(Array) #14 /var/www/vhosts/fqdn.de/host.fqdn.de/apps/previewgenerator/lib/Command/PreGenerate.php(96): OCA\PreviewGenerator\Command\PreGenerate->startProcessing() #15 /var/www/vhosts/fqdn.de/host.fqdn.de/3rdparty/symfony/console/Command/Command.php(256): OCA\PreviewGenerator\Command\PreGenerate->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput)) #16 /var/www/vhosts/fqdn.de/host.fqdn.de/3rdparty/symfony/console/Application.php(818): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput)) #17 /var/www/vhosts/fqdn.de/host.fqdn.de/3rdparty/symfony/console/Application.php(186): Symfony\Component\Console\Application->doRunCommand(Object(OCA\PreviewGenerator\Command\PreGenerate), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput)) #18 /var/www/vhosts/fqdn.de/host.fqdn.de/3rdparty/symfony/console/Application.php(117): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput)) #19 /var/www/vhosts/fqdn.de/host.fqdn.de/lib/private/Console/Application.php(169): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput)) #20 /var/www/vhosts/fqdn.de/host.fqdn.de/console.php(90): OC\Console\Application->run() #21 /var/www/vhosts/fqdn.de/host.fqdn.de/occ(11): require_once('/var/www/vhosts...') #22 {main}

[pludi]

With the current update to 1.0.2, which finally has working verbose output, I think I found one possible culprit: MP3s without embedded album covers. I renamed those, and for now it's working without a hitch.

[pieter-groeneweg]

If that is the issue, wouldn't it be a thing to have the app just skip a file when it returns an error?

[Tamsy]

@pludi: Thank you for pointing this out.

Unfortunately quite a few users on our Nextcloud Server have uploaded hundreds of MP3's onto their cloud-space. Not really feasible to ask them to check on their MP3's and rename those without embedded album covers ...

Just skipping files when they return an error would definitely be a better workaround!

[pieter-groeneweg]

As all hints (also in other #issues) to the MP3's I scavenged all issues in this repository and also that of gallery and server. Then I looked into "/lib/private/Preview/MP3.php" and commented out line 73

#$icon = \OC::$SERVERROOT . '/core/img/filetypes/audio.svg';

It is not that it cannot do any on mp3 without covers, it cannot do any with that replacement icon so it seems.

I ran the job again without errors. Job complete.

[umgfoin]

Just skipping files when they return an error would definitely be a better workaround!

Rather, a mandatory feature.

Somebody with sparetime to fix it? ;-)
++umgfoin

[pieter-groeneweg]

nextcloud/server#2739 is similar to what I did.

[Tamsy]

@pieter-groeneweg

commenting line 73
#$icon = \OC::$SERVERROOT . '/core/img/filetypes/audio.svg';

brings out Invalid JPEG file structure: two SOF markers here.