From bf80b78247ea79d59779b4e4a8a89d5f45a69cfc Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Sat, 19 Mar 2022 19:06:05 +0000
Subject: [PATCH] [DOM XSLT] Add fallback value conversions if not converted
 beforehand.

---
 dom/xslt/xslt/txMozillaXSLTProcessor.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/dom/xslt/xslt/txMozillaXSLTProcessor.cpp b/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
index 59cd09bd6a..0df80716c1 100644
--- a/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
+++ b/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
@@ -250,7 +250,13 @@ public:
     }
     nsresult getValue(txAExprResult** aValue)
     {
-        NS_ASSERTION(mTxValue, "variablevalue is null");
+        if (!mTxValue) {
+          // XXX: This should not happen as we normally convert values before
+          // we call this function. For corner cases where this isn't true, we
+          // perform the conversion here.
+          nsresult rv = Convert(mValue, getter_AddRefs(mTxValue));
+          NS_ENSURE_SUCCESS(rv, rv);
+        }        
 
         *aValue = mTxValue;
         NS_ADDREF(*aValue);