diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index 250f6128..e06536e3 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -416,7 +416,9 @@ static id<SDImageLoader> _defaultImageLoader;
     }
     
     if (mutableContext.count > 0) {
-        [mutableContext addEntriesFromDictionary:context];
+        if (context) {
+            [mutableContext addEntriesFromDictionary:context];
+        }
         context = [mutableContext copy];
     }