Generated SQL error / type error with operations on unique index

Argument of type 'SQL<unknown> | undefined' is not assignable to parameter of type 'SQL<unknown>'.
  Type 'undefined' is not assignable to type 'SQL<unknown>'.ts(2345)

CREATE UNIQUE INDEX `county_state_unique_idx` ON `locations` (`full_county_name`,`state_code`);
CREATE UNIQUE INDEX `state_unique_idx` ON `locations` (`state_code`) WHERE ("locations"."full_county_name" is null and "locations"."type" = 'state');

WHERE ("crexi_locations"."full_county_name" is null and "locations"."type" = ?);