diff --git a/SDWebImage/SDWebImageManager.m b/SDWebImage/SDWebImageManager.m
index e61f014..08226ad 100644
--- a/SDWebImage/SDWebImageManager.m
+++ b/SDWebImage/SDWebImageManager.m
@@ -123,6 +123,10 @@ static SDWebImageManager *instance;
     {
         url = [NSURL URLWithString:(NSString *)url];
     }
+    else if (![url isKindOfClass:NSURL.class])
+    {
+        url = nil; // Prevent some common crashes due to common wrong values passed like NSNull.null for instance
+    }
 
     if (!url || !delegate || (!(options & SDWebImageRetryFailed) && [failedURLs containsObject:url]))
     {