Unexpected error on sql tagged template string

Describe the bug
SafeQL throws multiple errors when using the sql tagged template string on Postgres, which leads to the errors below
Invalid Query: the type "string | PendingQuery<Row[]>" is not supported and Invalid Query: Error: syntax error at or near "DEFAULT" The query below will throw the above errors

export async function query(a: number, b: string, c: string) {
  return await sql`
    UPDATE
      try_safe_ql
    SET
      b = ${b},
      c = ${c || sql`DEFAULT`}
    WHERE
      a = ${a}
  `;
}

To Reproduce
Steps to reproduce the behavior:

1. Setup SafeQL
2. Use this code in .ts file

export async function query(a: number, b: string, c: string) {
  return await sql`
    UPDATE
      try_safe_ql
    SET
      b = ${b},
      c = ${c || sql`DEFAULT`}
    WHERE
      a = ${a}
  `;
}

Expected behavior
There shouldn't be an error when using sql tagged template string
**


Screenshots**

Desktop (please complete the following information):

• OS: MAC OS
• PostgreSQL version 14
• Version [e.g. 22]

Additional context
Add any other context about the problem here.