Error: Exception: SQLSTATE[HY000]: General error: 1021 Disk full (/tmp/#sql_13bbd9_0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") (in /data/www/heizoel.de/heizoel.de_releases/2018-08-10/wire/core/WireSaveableItemsLookup.php line 68)

#0 /data/www/heizoel.de/heizoel.de_releases/2018-08-10/wire/core/WireSaveableItemsLookup.php(68): PDOStatement->execute()
#1 /data/www/heizoel.de/heizoel.de_releases/2018-08-10/wire/core/Fieldgroups.php(61): ProcessWire\WireSaveableItemsLookup->___load(Object(ProcessWire\FieldgroupsArray), NULL)
#2 /data/www/heizoel.de/heizoel.de_releases/2018-08-10/wire/core/Wire.php(383): ProcessWire\Fieldgroups->___load(Object(ProcessWire\FieldgroupsArray))
#3 /data/www/heizoel.de/heizoel.de_releases/2018-08-10/wire/core/WireHooks.php(723): ProcessWire\Wire->_callMethod('___load', Array)
#4 /data/www/heizoel.de/heizoel.de_releases/2018-08-10/wire/core/Wire.php(442): ProcessWire\WireHooks->runHooks(Object(ProcessWire\Fieldgroups), 'load', Array)
#5 /data/www/he

This error message was shown because: site is in debug mode. ($config->debug = true; => /site/config.php). Error has been logged.