diff --git a/Pod/Classes/PHImageManager+TNKRequestImages.m b/Pod/Classes/PHImageManager+TNKRequestImages.m
index 3cd6928..5d42e49 100644
--- a/Pod/Classes/PHImageManager+TNKRequestImages.m
+++ b/Pod/Classes/PHImageManager+TNKRequestImages.m
@@ -30,8 +30,10 @@ - (NSDictionary *)requestImagesForAssets:(NSArray *)assets
         dispatch_group_enter(group);
         
         PHImageRequestID requestID = [self requestImageForAsset:asset targetSize:targetSize contentMode:contentMode options:options resultHandler:^(UIImage *result, NSDictionary *info) {
-            results[asset.localIdentifier] = result;
-            infos[asset.localIdentifier] = info;
+            if (result != nil && info != nil) {
+                results[asset.localIdentifier] = result;
+                infos[asset.localIdentifier] = info;
+            }
             
             dispatch_group_leave(group);
         }];
diff --git a/Pod/Classes/TNKAssetImageView.m b/Pod/Classes/TNKAssetImageView.m
index 065fdb0..3575438 100644
--- a/Pod/Classes/TNKAssetImageView.m
+++ b/Pod/Classes/TNKAssetImageView.m
@@ -22,12 +22,14 @@ @implementation TNKAssetImageView
 
 - (void)setAsset:(PHAsset *)asset
 {
-    [self cancelAssetImageRequest];
-    
-    _asset = asset;
-    self.image = self.defaultImage;
-    
-    [self setNeedsAssetReload];
+    if (_asset != asset) {
+        [self cancelAssetImageRequest];
+        
+        _asset = asset;
+        self.image = self.defaultImage;
+        
+        [self setNeedsAssetReload];
+    }
 }
 
 - (void)setNeedsAssetReload