diff --git a/SDImageCache.m b/SDImageCache.m
index b79c9915..b66fbba0 100644
--- a/SDImageCache.m
+++ b/SDImageCache.m
@@ -75,9 +75,9 @@ static SDImageCache *instance;
 
 - (void)dealloc
 {
-    SDWIRelease(memCache);
-    SDWIRelease(diskCachePath);
-    SDWIRelease(cacheInQueue);
+    SDWISafeRelease(memCache);
+    SDWISafeRelease(diskCachePath);
+    SDWISafeRelease(cacheInQueue);
 
     [[NSNotificationCenter defaultCenter] removeObserver:self];
 
diff --git a/SDWebImageCompat.h b/SDWebImageCompat.h
index c15e1704..b63dacb4 100644
--- a/SDWebImageCompat.h
+++ b/SDWebImageCompat.h
@@ -28,7 +28,8 @@
 #define SDWIRetain(__v) ([__v retain]);
 #define SDWIReturnRetained SDWIRetain
 
-#define SDWIRelease(__v) ([__v release], __v = nil);
+#define SDWIRelease(__v) ([__v release]);
+#define SDWISafeRelease(__v) ([__v release], __v = nil);
 #define SDWISuperDealoc [super dealloc];
 
 #define SDWIWeak
@@ -41,6 +42,7 @@
 #define SDWIReturnRetained(__v) (__v)
 
 #define SDWIRelease(__v)
+#define SDWISafeRelease(__v) (__v = nil);
 #define SDWISuperDealoc
 
 #define SDWIWeak __unsafe_unretained
@@ -70,7 +72,7 @@ NS_INLINE UIImage *SDScaledImageForPath(NSString *path, NSData *imageData)
         }
 
         UIImage *scaledImage = [[UIImage alloc] initWithCGImage:image.CGImage scale:scale orientation:UIImageOrientationUp];
-        SDWIRelease(image)
+        SDWISafeRelease(image)
         image = scaledImage;
     }
 
diff --git a/SDWebImageDecoder.m b/SDWebImageDecoder.m
index e747de68..1eecee05 100644
--- a/SDWebImageDecoder.m
+++ b/SDWebImageDecoder.m
@@ -76,7 +76,7 @@ static SDWebImageDecoder *sharedInstance;
 
 - (void)dealloc
 {
-    SDWIRelease(imageDecodingQueue);
+    SDWISafeRelease(imageDecodingQueue);
     SDWISuperDealoc;
 }
 
diff --git a/SDWebImageDownloader.m b/SDWebImageDownloader.m
index 1fa49f39..2dc493b5 100644
--- a/SDWebImageDownloader.m
+++ b/SDWebImageDownloader.m
@@ -153,10 +153,10 @@ NSString *const SDWebImageDownloadStopNotification = @"SDWebImageDownloadStopNot
 - (void)dealloc
 {
     [[NSNotificationCenter defaultCenter] removeObserver:self];
-    SDWIRelease(url);
-    SDWIRelease(connection);
-    SDWIRelease(imageData);
-    SDWIRelease(userInfo);
+    SDWISafeRelease(url);
+    SDWISafeRelease(connection);
+    SDWISafeRelease(imageData);
+    SDWISafeRelease(userInfo);
     SDWISuperDealoc;
 }
 
diff --git a/SDWebImageManager.m b/SDWebImageManager.m
index b518db58..b6f9bb49 100644
--- a/SDWebImageManager.m
+++ b/SDWebImageManager.m
@@ -46,12 +46,12 @@ static SDWebImageManager *instance;
 
 - (void)dealloc
 {
-    SDWIRelease(downloadDelegates);
-    SDWIRelease(downloaders);
-    SDWIRelease(cacheDelegates);
-    SDWIRelease(cacheURLs);
-    SDWIRelease(downloaderForURL);
-    SDWIRelease(failedURLs);
+    SDWISafeRelease(downloadDelegates);
+    SDWISafeRelease(downloaders);
+    SDWISafeRelease(cacheDelegates);
+    SDWISafeRelease(cacheURLs);
+    SDWISafeRelease(downloaderForURL);
+    SDWISafeRelease(failedURLs);
     SDWISuperDealoc;
 }