[Resolved] Saving widgets shows a critical error message

 array (
    'content' => '<!-- wp:acf/about-us {"name":"acf/about-us","data":{"field_6153243e2ccbc":"\u003cstrong\u003eBrightAnalytics\u003c/strong\u003e, geconsolideerde management rapportage\r\n\r\nIntuïtief, betrouwbaar en snel. Neem goede beslissingen met up-to-date financiële en operationele data. 02","field_615324502ccbd":{"row-0":{"field_615324562ccbe":{"title":"Contacteer ons","url":"<em><u>hidden link</u></em>","target":"","rel":""}},"row-1":{"field_615324562ccbe":{"title":"Vraag een demo aan","url":"<em><u>hidden link</u></em>","target":"","rel":""}}}},"align":"","mode":"auto","wpml_language":"nl-nl"} /-->',
    'title' => false,
  )

	public function add_block_data_attribute_strings( array $strings, WP_Block_Parser_Block $block ) {

		if ( $this->is_acf_block( $block ) && isset( $block->attrs['data'] ) ) {

			if ( ! is_array( $block->attrs['data'] ) ) {
				$block->attrs['data'] = array( $block->attrs['data'] );
			}

			foreach ( $block->attrs['data'] as $field_name => $text ) {

				if ( $this->must_skip( $field_name, $text ) ) {
					continue;
				}

				$type = $this->get_text_type( $text );

				if ( 'array' === $type ) {
					foreach ( $text as $inner_field_name => $inner_text ) {
						$inner_type = $this->get_text_type( $inner_text );
						if ( 'array' === $inner_type ) {
							foreach ( $inner_text as $inner_field_name_2nd => $inner_text_2nd ) {
								$inner_type2 = $this->get_text_type( $inner_text_2nd );
								if ( 'array' === $inner_type2 ) {
									foreach ( $inner_text_2nd as $inner_field_name_3rd => $inner_text_3rd ) {
										$inner_type3 = $this->get_text_type( $inner_text_3rd );
										$strings[] = $this->add_string( $block, $inner_text_3rd, $field_name . '/' . $inner_field_name_3rd, $inner_type3 );
									}
								}
							}
						} else {
							$strings[] = $this->add_string( $block, $inner_text, $field_name . '/' . $inner_field_name, $inner_type );
						}
					}
				} else {
					$strings[] = $this->add_string( $block, $text, $field_name, $type );
				}
			}
		}

		return $strings;
	}