If there is no reason, then no. An employer does not need a valid reason, or any reason. An employer has the absolute right to terminate you at the end of your contract even if there is no reason.
If there is a reason, then maybe. If an employer terminates someone for certain very specific illegal reasons, such as race, religion, gender, membership in the national guard, etc., then you can sue for that.
But if it was for any other reason, even a bad one, or even if it was completely random, then it doesn't matter whether the judge agrees with the boss or not, because it's not up to the judge; it's up to the boss, unless there is an illegal reason.
A termination is "wrongful" in two situations: (1) if there is an illegal reason, and (2) if it violates the contract.
Lack of a valid reason doesn't make it wrongful. If an employer is accused of wrongful termination but proves that they decided which employee to fire by flipping a coin, that's actually a good defense, because bad luck isn't an illegal reason.