}

		delete_option( $this->error_opt_key );

	}

	/**
	 * Process fields to setup navigation and content with minimal PHP loops.
	 *
	 * Called by `$this->output()` before actually outputting html.
	 *
	 * @since 3.0.0
	 * @since 3.16.14 Unknown.
	 * @since 6.0.0 Move single field processing logic to a specific method {@see LLMS_Admin_Metabox::process_field()}.
	 *
	 * @return void
	 */
	private function process_fields() {

		// Create a filter-safe ID that conforms to WordPress coding standards for hooks.
		$id = str_replace( '-', '_', $this->id );

		/**
		 * Customize metabox fields prior to field processing.
		 *
		 * The dynamic portion of this filter, `$id`, corresponds to the classes `$id` property with
		 * dashes (`-`) replaced with underscores (`_`). If the class id is "my-metabox" the filter would be
		 * "llms_metabox_fields_my_metabox".
		 *
		 * @since Unknown
		 *
		 * @param array $fields Array of metabox fields.
		 */
		$fields = apply_filters( "llms_metabox_fields_{$id}", $this->get_fields() );

		$this->total_tabs = count( $fields );

		foreach ( $fields as $i => $tab ) {

			$i++;
			$current = 1 === $i ? ' llms-active' : '';

			$this->navigation .= '<li class="llms-nav-item tab-link ' . $current . '" data-tab="' . $this->id . '-tab-' . $i . '"><span class="llms-nav-link">' . $tab['title'] . '</span></li>';

			$this->content .= '<div id="' . $this->id . '-tab-' . $i . '" class="tab-content' . $current . '"><ul>';

			foreach ( $tab['fields'] as $field ) {
				$this->content .= $this->process_field( $field );
			}

			$this->content .= '</ul></div>';

		}

	}

	/**
	 * Process single field.