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Sorry, due to an error, we are unable to fulfill your request at the moment. You may want to contact your administrator or service provider with more details about what action you were performing when this occurred. Invalid cache key: Not a string

public static function assertValidKey($key) {
    $strict = CRM_Utils_Constant::value('CIVICRM_PSR16_STRICT', FALSE) || defined('CIVICRM_TEST');
    if (!is_string($key)) {
      throw new CRM_Utils_Cache_InvalidArgumentException("Invalid cache key: Not a string");
    }

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