Database error (InstanceTopic, 2)

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Oxygen
A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:
(SQL query hidden)
from within function "IndexPager::reallyDoQuery (LogPager)". Database returned error "1021: Disk full (/var/tmp/#sql_4024_0); waiting for someone to free some space... (localhost)".