From 3bb64bc1ccba287d6667b8d2cbddd5b74916005b Mon Sep 17 00:00:00 2001
From: Mike Donahue <development.md@gmail.com>
Date: Thu, 12 Sep 2019 01:07:21 -0400
Subject: [PATCH] Fix CFRelease crash in ASTextNode2 (#1669)

- Add null check before CFRelease
---
 Source/ASTextNode2.mm | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Source/ASTextNode2.mm b/Source/ASTextNode2.mm
index 1d589503..cb6a9541 100644
--- a/Source/ASTextNode2.mm
+++ b/Source/ASTextNode2.mm
@@ -674,11 +674,17 @@ static NSArray *DefaultLinkAttributeNames() {
       
       CTLineRef truncationTokenLine = CTLineCreateWithAttributedString((CFAttributedStringRef)_truncationAttributedText);
       CFIndex truncationTokenLineGlyphCount = truncationTokenLine ? CTLineGetGlyphCount(truncationTokenLine) : 0;
-      CFRelease(truncationTokenLine);
+      
+      if (truncationTokenLine) {
+        CFRelease(truncationTokenLine);
+      }
       
       CTLineRef additionalTruncationTokenLine = CTLineCreateWithAttributedString((CFAttributedStringRef)_additionalTruncationMessage);
-      CFIndex additionalTruncationTokenLineGlyphCount = additionalTruncationTokenLine ? CTLineGetGlyphCount(additionalTruncationTokenLine) : 0;   
-      CFRelease(additionalTruncationTokenLine);
+      CFIndex additionalTruncationTokenLineGlyphCount = additionalTruncationTokenLine ? CTLineGetGlyphCount(additionalTruncationTokenLine) : 0;
+      
+      if (additionalTruncationTokenLine) {
+        CFRelease(additionalTruncationTokenLine);
+      }
 
       switch (_textContainer.truncationType) {
         case ASTextTruncationTypeStart: {