RSS Feed/News ErrorException: [E_WARNING] Array to string conversion if custom field has unexpected value

[ENXF NET]

Code:

#0 src/XF/CustomField/Definition.php(334): XF::handlePhpError(2, '[E_WARNING] Arr...', '<redactedpath>', 334)
#1 src/XF/CustomField/Definition.php(320): XF\CustomField\Definition->_validateFieldTypeMultiselect(Array, NULL, NULL)
#2 src/XF/CustomField/Definition.php(244): XF\CustomField\Definition->_validateFieldTypeCheckbox(Array, NULL, NULL)
#3 src/XF/CustomField/Set.php(204): XF\CustomField\Definition->isValid(Array, NULL, NULL)
#4 src/XF/CustomField/Set.php(110)...

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