Cannot implicitly convert type

public GameObject thisClient;

void OnCollisionEnter2D (Collision2D coll) {
	if (coll.gameObject.name == "Client")
	thisClient = coll.gameObject;
}

Cannot implicitly convert type UnityEngine.GameObject to UnityEngine.GameObject

Why it doesn’t work?

Just needs this change:

//public GameObject[] thisClient;
public GameObject thisClient;