diff --git a/RNFSManager.m b/RNFSManager.m
index 613082f..5e733d6 100755
--- a/RNFSManager.m
+++ b/RNFSManager.m
@@ -463,7 +463,7 @@ RCT_EXPORT_METHOD(downloadFile:(NSDictionary *)options
                                                  body:@{@"jobId": jobId,
                                                         @"statusCode": statusCode,
                                                         @"contentLength": contentLength,
-                                                        @"headers": headers}];
+                                                        @"headers": headers || [NSNull null]}];
   };
 
   params.progressCallback = ^(NSNumber* contentLength, NSNumber* bytesWritten) {