Fehlermeldung bei Eingabefeldern "Ganze Zahl"

Fehlermeldung: Given value does not match format for field 'entryOption6'.
/lib/system/form/builder/field/NumericRangeFormField.class.php (88)

/lib/system/option/EntryOptionHandler.class.php (775): wcf\system\form\builder\field\NumericRangeFormField->value(…)
/lib/system/option/EntryOptionHandler.class.php (319): entries\system\option\EntryOptionHandler->applyFormFieldValue(…)
/lib/system/option/EntryOptionHandler.class.php (290): entries\system\option\EntryOptionHandler->getOption(…)
/lib/system/listView/EntryListView.class.php (687): entries\system\option\EntryOptionHandler->getOptions(…)
/lib/system/listView/EntryListView.class.php (117): entries\system\listView\EntryListView->populateFilterableOptions(…)
/lib/page/EntryListPage.class.php (126): entries\system\listView\EntryListView->__construct(…)
/lib/page/EntryListPage.class.php (39): entries\page\EntryListPage->createListView(…)
/lib/page/AbstractPage.class.php (117): entries\page\EntryListPage->readParameters(…)
/lib/system/request/Request.class.php (54): wcf\page\AbstractPage->__run(…)
/lib/http/middleware/HandleValinorMappingErrors.class.php (35): wcf\system\request\Request->handle(…)
/lib/system/request/RequestHandler.class.php (168): wcf\http\Pipeline->process(…)
/verzeichnis/index.php (4): wcf\system\request\RequestHandler->handle(…)