From b39b43014b4b1b3d6f7b209c251ab78a920366eb Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@wolfbeast.com>
Date: Fri, 17 May 2019 01:57:45 +0000
Subject: [PATCH] Add nullcheck.

This resolves #1088
---
 dom/xslt/base/txURIUtils.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dom/xslt/base/txURIUtils.cpp b/dom/xslt/base/txURIUtils.cpp
index 3f3556f801..bce2f8d0f3 100644
--- a/dom/xslt/base/txURIUtils.cpp
+++ b/dom/xslt/base/txURIUtils.cpp
@@ -45,6 +45,10 @@ void URIUtils::resolveHref(const nsAString& href, const nsAString& base,
 void
 URIUtils::ResetWithSource(nsIDocument *aNewDoc, nsINode *aSourceNode)
 {
+	if (!aSourceNode) {
+		return;
+	}
+
     nsCOMPtr<nsIDocument> sourceDoc = aSourceNode->OwnerDoc();
     nsIPrincipal* sourcePrincipal = sourceDoc->NodePrincipal();