Can anyone help please?

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Notice: unserialize() [function.unserialize]: Argument is not a string in /var/www/vhosts/mywebsite.co.uk/httpdocs/system/library/customer.php on line 66

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/mywebsite.co.uk/httpdocs/system/library/customer.php:66) in /var/www/vhosts/mywebsite.co.uk/httpdocs/system/engine/controller.php on line 23

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			if (($query->row['cart']) && (is_string($query->row['cart']))) {
				$cart = unserialize($query->row['cart']);
				
				foreach ($cart as $key => $value) {
					if (!array_key_exists($key, $this->session->data['cart'])) {
						$this->session->data['cart'][$key] = $value;
					} else {
						$this->session->data['cart'][$key] += $value;
					}
				}			
			}

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foreach ((array)@unserialize($query->row['cart']) as $key => $value) {
	if (!array_key_exists($key, $this->session->data['cart'])) {
		$this->session->data['cart'][$key] = $value;
	} else {
		$this->session->data['cart'][$key] += $value;
	}
}

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if (($query->row['cart']) && (is_string($query->row['cart']))) {
	$cart = unserialize($query->row['cart']);
	foreach ($cart as $key => $value) {
		if (!array_key_exists($key, $this->session->data['cart'])) {
			$this->session->data['cart'][$key] = $value;
		} else {
			$this->session->data['cart'][$key] += $value;
		}
	}         
}