Object reference not set to an instance of an object

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1

Fedora 28. Unencrypted backup to a local drive. Has been working, don’t know what changed:
Tried “Delete the local database and re-generate.” but it did not help.

Failed to process index file: duplicati-ife5c1abe8ad5472b8cbf8fd0d36169d3.dindex.zip

System.NullReferenceException: Object reference not set to an instance of an object at SharpCompress.Readers.AbstractReader2[TEntry,TVolume].get_Entry () [0x00000] in &lt;e590b95deffd47918abc01584b2527c9&gt;:0 at SharpCompress.Readers.AbstractReader2[TEntry,TVolume].LoadStreamForReading (System.IO.Stream stream) [0x0001e] in <e590b95deffd47918abc01584b2527c9>:0 at SharpCompress.Readers.AbstractReader`2[TEntry,TVolume].MoveToNextEntry () [0x0002c] in <e590b95deffd47918abc01584b2527c9>:0 at Duplicati.Library.Compression.FileArchiveZip.LoadEntryTable () [0x000d2] in <dfbede134c9440fdbadee9fd8b93d348>:0