magento2 – URI is not valid and cannot be converted into a string


I’m struggling with an error that is thrown in the debug.log. The problem is that multiple indexers are not updated allthough the cronjobs are running.

Re-indexing by CLI is working properly on all indexers but that cannot be the solution.

The debug.log

(2020-09-17 05:25:12) main.ERROR: Cron Job indexer_reindex_all_invalid has an error: URI is not valid and cannot be converted into a string. Statistics: {"sum":0,"count":1,"realmem":0,"emalloc":0,"realmem_start":146800640,"emalloc_start":143814352} () ()
(2020-09-17 05:25:12) main.CRITICAL: URI is not valid and cannot be converted into a string {"exception":"(object) (Laminas\Uri\Exception\InvalidUriException(code: 0): URI is not valid and cannot be converted into a string at /PATH/web/vendor/laminas/laminas-uri/src/Uri.php:363)"} ()

I took a look at the specified line but it’s just the function that throws the exception. How can i find the ‘url’ that is causing the problem?

Config:

  • Magento 2.3.5.-p1
  • PHP 7.3-Stable

Thanks