Steps to reproduce the issue

1. Start the Smart Search indexer in the Joomla admin panel.
2. While the indexer is running, access a Smart Search results page that includes the result with the manually emptied 'object' value.
3. Observe that a 500 error occurs.

Expected result

No 500 error should occur while browsing Smart Search results, regardless of the indexing status. Results with incomplete data should not appear until fully indexed.

Actual result

A 500 error occurs stating "Attempt to assign property 'cleanURL' on bool" when attempting to browse Smart Search results that include items currently being indexed with an empty 'object' value.

System information (as much as possible)

Joomla 4.4.4
PHP 8.1

Additional comments

This issue occurs due to the indexer temporarily setting the 'object' column to an empty value during the indexing process, which leads to deserialization issues when accessed before the indexing is complete.