diff --git a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/FileLfsServlet.java b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/FileLfsServlet.java
index a8e3c11e2..15c4448da 100644
--- a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/FileLfsServlet.java
+++ b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/FileLfsServlet.java
@@ -202,6 +202,11 @@ public class FileLfsServlet extends HttpServlet {
 	 */
 	protected static void sendError(HttpServletResponse rsp, int status, String message)
 			throws IOException {
+		if (rsp.isCommitted()) {
+			rsp.getOutputStream().close();
+			return;
+		}
+		rsp.reset();
 		rsp.setStatus(status);
 		PrintWriter writer = rsp.getWriter();
 		gson.toJson(new Error(message), writer);