diff --git a/platform/http_thread_apple.mm b/platform/http_thread_apple.mm
index a3ed5e102c..5f6f54e208 100644
--- a/platform/http_thread_apple.mm
+++ b/platform/http_thread_apple.mm
@@ -188,7 +188,11 @@ static id<DownloadIndicatorProtocol> downloadIndicator = nil;
   UNUSED_VALUE(connection);
   int64_t const length = [data length];
   m_downloadedBytes += length;
-  m_callback->OnWrite(m_begRange + m_downloadedBytes - length, [data bytes], length);
+  if(!m_callback->OnWrite(m_begRange + m_downloadedBytes - length, [data bytes], length))
+  {
+    [m_connection cancel];
+    m_callback->OnFinish(-1, m_begRange, m_endRange);
+  }
 }
 
 - (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error