Error in the Backend Template

[LuboTomov]

Hi.
There is an error generated in the error log on the site an some image glitches on the admin panel and on the site.

PHP Warning: implode(): Invalid arguments passed in /home/*/public_html/system/modules/core/classes/BackendTemplate.php on line 163
#0 [internal function]: __error(2, 'implode(): Inva...', '/home//...', 163, Array)
#1 /home//public_html/system/modules/core/classes/BackendTemplate.php(163): implode('","', NULL)
#2 /home//public_html/system/modules/core/templates/backend/be_main.html5(43): Contao\BackendTemplate->getDateString()
#3 /home//public_html/system/modules/core/library/Contao/BaseTemplate.php(88): include('/home/bicbgqwt/...')
#4 /home/t/public_html/system/modules/core/library/Contao/Template.php(277): Contao\BaseTemplate->parse()
#5 /home//public_html/system/modules/core/classes/BackendTemplate.php(34): Contao\Template->parse()
#6 /home//public_html/system/modules/core/classes/BackendTemplate.php(107): Contao\BackendTemplate->parse()
#7 /home//public_html/system/modules/core/controllers/BackendMain.php(275): Contao\BackendTemplate->output()
#8 /home//public_html/system/modules/core/controllers/BackendMain.php(135): Contao\BackendMain->output()
#9 /home/***/public_html/contao/main.php(20): Contao\BackendMain->run()
#10 {main}

If someone can help me I will be grateful.

[Spooky]

1. Update Contao to the newest version.
2. Validate your Contao installation with the Contao Check.
3. If the error persists, execute Contao in safe mode.