Fix crash when the asset in Photo Stream is selected

Pod/Classes/QBImagePickerController.m

@@ -256,21 +256,44 @@ - (NSArray *)sortAssetsGroups:(NSArray *)assetsGroups typesOrder:(NSArray *)type
 - (void)passSelectedAssetsToDelegate
 {
     // Load assets from URLs
+    // The asset will be ignored if it is not found
     __block NSMutableArray *assets = [NSMutableArray array];
+    __weak typeof(self) weakSelf = self;
 
-    for (NSURL *selectedAssetURL in self.selectedAssetURLs) {
-        __weak typeof(self) weakSelf = self;
-        [self.assetsLibrary assetForURL:selectedAssetURL
+    void (^checkNumberOfAssets)(void) = ^{
+        if (assets.count == weakSelf.selectedAssetURLs.count) {
+            // Delegate
+            if (self.delegate && [self.delegate respondsToSelector:@selector(qb_imagePickerController:didSelectAssets:)]) {
+                [self.delegate qb_imagePickerController:self didSelectAssets:[assets copy]];
+            }
+        }
+    };
+
+    for (NSURL *assetURL in self.selectedAssetURLs) {
+        [self.assetsLibrary assetForURL:assetURL
                             resultBlock:^(ALAsset *asset) {
-                                // Add asset
-                                [assets addObject:asset];
-
-                                // Check if the loading finished
-                                if (assets.count == weakSelf.selectedAssetURLs.count) {
-                                    // Delegate
-                                    if (self.delegate && [self.delegate respondsToSelector:@selector(qb_imagePickerController:didSelectAssets:)]) {
-										[self.delegate qb_imagePickerController:self didSelectAssets:[assets copy]];
-                                    }
+                                if (asset) {
+                                    // Add asset
+                                    [assets addObject:asset];
+
+                                    // Check if the loading finished
+                                    checkNumberOfAssets();
+                                } else {
+                                    [self.assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupPhotoStream usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
+                                        [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
+                                            if ([result.defaultRepresentation.url isEqual:assetURL]) {
+                                                // Add asset
+                                                [assets addObject:result];
+
+                                                // Check if the loading finished
+                                                checkNumberOfAssets();
+
+                                                *stop = YES;
+                                            }
+                                        }];
+                                    } failureBlock:^(NSError *error) {
+                                        NSLog(@"Error: %@", [error localizedDescription]);
+                                    }];
                                 }
                             } failureBlock:^(NSError *error) {
                                 NSLog(@"Error: %@", [error localizedDescription]);