PHP Warning: Trying to access array offset on value of type null

Software Support
1

Hey, I’m trying to add Form Items in Review Forms but every time I press create new Item it generates the following error:
Failed Ajax request or invalid JSON returned.

image

and in the error log:
[Mon Aug 30 11:52:45.143422 2021] [php:warn] [pid 5691] [client 82.137.200.44:47216] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:00.416824 2021] [php:warn] [pid 5690] [client 82.137.200.44:53630] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:00.837439 2021] [php:warn] [pid 5690] [client 82.137.200.44:53630] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:00.844340 2021] [php:warn] [pid 5686] [client 82.137.200.44:53714] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:00.850553 2021] [php:warn] [pid 5735] [client 82.137.200.44:53894] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:26.116212 2021] [php:warn] [pid 5691] [client 82.137.200.44:24313] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:26.155466 2021] [php:warn] [pid 5691] [client 82.137.200.44:24313] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:26.695111 2021] [php:warn] [pid 5688] [client 82.137.200.44:34536] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:26.703686 2021] [php:warn] [pid 5691] [client 82.137.200.44:24313] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:53:41.733044 2021] [php:warn] [pid 6892] [client 82.137.200.44:26856] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:54:11.753263 2021] [php:warn] [pid 6894] [client 82.137.200.44:62423] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة
[Mon Aug 30 11:54:12.885376 2021] [php:warn] [pid 6894] [client 82.137.200.44:62423] PHP Warning: Trying to access array offset on value of type null in /var/www/html/plugins/themes/default/DefaultThemePlugin.inc.php on line 163, referer: الدخول | مجلة جامعة المنارة

Noting that the version of OJS is : 3.3.0.4

Please Can you help with this problem?

Thank you.

2

I have experienced the same error when I moved my website files to a new host. After a few days, I suspected it may be caused by the PHP version I was running on. I changed my PHP version and it worked. You can try change the version you are running on. Also, if changing the version does not work, try nest the line giving the error