OJS 3.4 and lucene plugin

Describe the issue or problem

We’ve juste upgarded our ojs to 3.4 and Use lucene for content indexing.

Issue: During the indexing process, the following warning appears: PHP Warning: Undefined array key “host” in /data/journals/ojs340/lib/pkp/classes/core/PKPRouter.php on line 451. 43 articles scheduled for indexation. My solr indicate that we have 2758 in Num Docs but ojs still displaying no result for any search.

Question: Is this a compatibility issue between OJS 3.4 anec lucene plugin, or should I look for the error elsewhere?

Thank you

What application are you using?
For example, OJS 3.4.0-10

Additional information

We use push for indexing