From t5\he available information when I debug, all the affected plugins are joomla core plugin and uninstalling or disabling these plugins are not posible.

Error decoding JSON data: Syntax error

Call stack
# Function Location
1 JApplicationCms->execute() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/index.php:49
2 JApplicationSite->doExecute() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/cms.php:261
3 JApplicationSite->initialiseApp() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/site.php:209
4 JApplicationCms->initialiseApp() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/site.php:681
5 JPluginHelper::importPlugin() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/cms.php:669
6 JPluginHelper::import() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/plugin/helper.php:170
7 plgSystemJblibrary->__construct() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/plugin/helper.php:255
8 JPlugin->__construct() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/plugins/system/jblibrary/jblibrary.php:45
9 Joomla\Registry\Registry->loadString() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/plugin/plugin.php:75
10 Joomla\Registry\Format\Json->stringToObject() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/vendor/joomla/registry/src/Registry.php:366