[TYPO3-Solr] Scheduler tasks sends delete queries

[Rik Willems]

Hi!

I keep having a problem with one site, that other sites don't have. The 
scheduler task keeps sending delete queries at seemingly random 
intervals. Because of this the website ends up with an empty index.

Devlog shows the following:
<delete fromPending="true" fromCommitted="true"><query>(endtime:[* TO 
NOW] AND -endtime:"1970-01-01T01:00:00Z")</query></delete>

Any suggestions on how to prevent this?

Cheers! Rik