RSS Feed/News Saving User Errors

[ENXF NET]

Whenever I try to save a user's profile info, even my own, I get this error message. Note: It only happens for a few users, not all. Any idea what the issue is? Thanks

ErrorException: [E_WARNING] Undefined array key "regex" in src/XF/CustomField/Definition.php at line 428

1. XF::handlePhpError() in src/XF/CustomField/Definition.php at line 428
2. XF\CustomField\Definition->_validateMatchTypeRegex() in src/XF/CustomField/Definition.php at...

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