Joomla problem after upgrading to 3.6.3 – Error decoding JSON data: object property name separator ‘:’ expected the bad data is: {“”}

After upgrading to Joomla 3.6.3 I got this error message when trying to login to administrator:

Error decoding JSON data: object property name separator ':' expected the bad data is: {""}

Solution was found here using the method suggested by Brent Laminack.

You need to issue the following SQL command using for example phpmyadmin:

update TABLEPREFIX_modules set params = '' where params like '%{""}%';

Note that you must replace TABLEPREFIX above with the prefix your Joomla installation is using.