diff --git a/SDWebImage/UIButton+WebCache.m b/SDWebImage/UIButton+WebCache.m
index 3df3804f..ce2175d2 100644
--- a/SDWebImage/UIButton+WebCache.m
+++ b/SDWebImage/UIButton+WebCache.m
@@ -57,8 +57,8 @@ static char imageURLStorageKey;
         [self.imageURLStorage removeObjectForKey:@(state)];
         
         dispatch_main_async_safe(^{
-            NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:-1 userInfo:@{NSLocalizedDescriptionKey : @"Trying to load a nil url"}];
             if (completedBlock) {
+                NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:-1 userInfo:@{NSLocalizedDescriptionKey : @"Trying to load a nil url"}];
                 completedBlock(nil, error, SDImageCacheTypeNone, url);
             }
         });
diff --git a/SDWebImage/UIImageView+WebCache.m b/SDWebImage/UIImageView+WebCache.m
index ec0d2e98..14f425cc 100644
--- a/SDWebImage/UIImageView+WebCache.m
+++ b/SDWebImage/UIImageView+WebCache.m
@@ -87,8 +87,8 @@ static char TAG_ACTIVITY_SHOW;
     } else {
         dispatch_main_async_safe(^{
             [self removeActivityIndicator];
-            NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:-1 userInfo:@{NSLocalizedDescriptionKey : @"Trying to load a nil url"}];
             if (completedBlock) {
+                NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:-1 userInfo:@{NSLocalizedDescriptionKey : @"Trying to load a nil url"}];
                 completedBlock(nil, error, SDImageCacheTypeNone, url);
             }
         });