If you made update on Joomla 3.7 and choose our Shyinn Joomla template,

in your page, you will se an error

Cannot use a scalar value as an array in   …..   libraries/cms/html/html.php on line 693

So, go to your site … /libraries/cms/html/ choose file html.php  and replace all code from this file html.php

To fix this error, change file with this code (delete all code from page html.php and add this new code) from libraries/cms/html/html.php