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Trying to access array offset on value of type bool at CalDavBackend.php#996

3

### Steps to reproduce 1. Outlook 2019 + CalDav Synchronizer. Also mobile phone Android + DavX two way synchronization enabled. 2. Create calendar and enable two way integration on both...

**What version of Invoice Ninja are you running? ie v4.5 / v5** v5.8.37-C156 **What environment are you running?** Ubuntu self hosted **Have you searched existing issues/requests?** Yes **Additional context** Background:...