From 66da77ec41e3bf3918a38395577de38b5f57381f Mon Sep 17 00:00:00 2001
From: Fedor <fedor@mail.ru>
Date: Thu, 7 May 2020 14:45:34 +0300
Subject: [PATCH] Perform validity check before trying to use the content.

---
 editor/libeditor/HTMLStyleEditor.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/editor/libeditor/HTMLStyleEditor.cpp b/editor/libeditor/HTMLStyleEditor.cpp
index bc7141ad3..6a1ffe8b4 100644
--- a/editor/libeditor/HTMLStyleEditor.cpp
+++ b/editor/libeditor/HTMLStyleEditor.cpp
@@ -333,8 +333,9 @@ HTMLEditor::SetInlinePropertyOnTextNode(Text& aText,
   RefPtr<Text> text = &aText;
   if (uint32_t(aEndOffset) != aText.Length()) {
     // We need to split off back of text node
-    text = SplitNode(aText, aEndOffset, rv)->GetAsText();
+    nsIContent* textNode = SplitNode(aText, aEndOffset, rv);
     NS_ENSURE_TRUE(!rv.Failed(), rv.StealNSResult());
+    text = textNode->GetAsText();
   }
 
   if (aStartOffset) {