From d1eea26cd67d4b19f93fa319bd857c6ffb0c277e Mon Sep 17 00:00:00 2001
From: zhongwuzw <zhongwuzw@qq.com>
Date: Wed, 10 Apr 2019 16:00:24 +0800
Subject: [PATCH] Fixes crash for apng coder when properties are nil

---
 SDWebImage/SDImageAPNGCoder.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/SDWebImage/SDImageAPNGCoder.m b/SDWebImage/SDImageAPNGCoder.m
index 64384122..52f2060d 100644
--- a/SDWebImage/SDImageAPNGCoder.m
+++ b/SDWebImage/SDImageAPNGCoder.m
@@ -154,6 +154,9 @@ const CFStringRef kCGImagePropertyAPNGUnclampedDelayTime = (__bridge CFStringRef
     float frameDuration = 0.1f;
     CFDictionaryRef cfFrameProperties = CGImageSourceCopyPropertiesAtIndex(source, index, nil);
     NSDictionary *frameProperties = (__bridge NSDictionary *)cfFrameProperties;
+    if (!frameProperties) {
+        return frameDuration;
+    }
     NSDictionary *pngProperties = frameProperties[(NSString *)kCGImagePropertyPNGDictionary];
     
     NSNumber *delayTimeUnclampedProp = pngProperties[(__bridge NSString *)kCGImagePropertyAPNGUnclampedDelayTime];