Fatal error 'JsonSerializable' not found in joomla/registry/registry.php

Getting fatal error into error log on server 'JsonSerializable' not found in joomla/registry/registry.php

Solutions is about to install the php5-json package on the server . its happen when server upgrade etc.

Or

solution is to modify the files : jsonserializable.php  , import.legacy.php  and import.php

https://github.com/joomla/joomla-cms/commit/dac8a08d30ed7580b546544c4b9a1da19c3fd7de#diff-77cfb2cd14913be693359ab6ec4da572