class-wp-query.php のエラー

Webサイトのエラーログに以下が頻繁にあります。

/wp-includes/class-wp-query.php on line 3903

とあります。
そこのソースは以下です。

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public function is_category( $category = '' ) {
		if ( ! $this->is_category ) {
			return false;
		}

		if ( empty( $category ) ) {
			return true;
		}

		$cat_obj = $this->get_queried_object();

		$category = array_map( 'strval', (array) $category );

【3903】		if ( in_array( (string) $cat_obj->term_id, $category, true ) ) {
			return true;
【3905】		} elseif ( in_array( $cat_obj->name, $category, true ) ) {
			return true;
【3907】		} elseif ( in_array( $cat_obj->slug, $category, true ) ) {
			return true;
		}

		return false;
	}

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どのように修正すればいいでしょうか？
教えてくださいませ。

以下、エラーの全文です。
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2022/07/04 **:**:** [error] 16635#0: *3604370 FastCGI sent in stderr: "PHP message: PHP Warning: Attempt to read property "term_id" on null in *****/wp-includes/class-wp-query.php on line 3903PHP message: PHP Warning: Attempt to read property "name" on null in *****/wp-includes/class-wp-query.php on line 3905PHP message: PHP Warning: Attempt to read property "slug" on null in *****/wp-includes/class-wp-query.php on line 3907PHP message: PHP Warning: Attempt to read property "term_id" on null in *****/wp-includes/class-wp-query.php on line 3903PHP message: PHP Warning: Attempt to read property "name" on null in *****/wp-includes/class-wp-query.php on line 3905PHP message: PHP Warning: Attempt to read property "slug" on null in *****/wp-includes/class-wp-query.php on line 3907PHP message: PHP Warning: Attempt to read property "term_id" on null in *****/wp-includes/class-wp-query.php on line 3903PHP message: PHP Warning: Attempt to read property "name" on null in *****/wp-includes/class-wp-query.php on line 3905PHP message: PHP Warning: Attempt to read property "slug" on null in *****/wp-includes/class-wp-query.php on line 3907", client: *******, server: ******, request: "GET / HTTP/1.1", host: "******"

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