From 055b7e7c12f14714be9f62413dba4c0a7e7b36f3 Mon Sep 17 00:00:00 2001
From: Matthias Schmidt <gravatronics@live.com>
Date: Sun, 14 Apr 2019 09:33:47 +0200
Subject: [PATCH] Throw exception in `FormDocument::getHtml()` if form has not
 been built

See #2509
---
 .../files/lib/system/form/builder/FormDocument.class.php      | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wcfsetup/install/files/lib/system/form/builder/FormDocument.class.php b/wcfsetup/install/files/lib/system/form/builder/FormDocument.class.php
index 302b00248c..48555ada6a 100644
--- a/wcfsetup/install/files/lib/system/form/builder/FormDocument.class.php
+++ b/wcfsetup/install/files/lib/system/form/builder/FormDocument.class.php
@@ -406,6 +406,10 @@ class FormDocument implements IFormDocument {
 	 * @inheritDoc
 	 */
 	public function getHtml() {
+		if (!$this->isBuilt) {
+			throw new \BadMethodCallException("The form document has to be built before it can be rendered.");
+		}
+		
 		return WCF::getTPL()->fetch(
 			'__form',
 			'wcf',
-- 
2.20.1