From 9f96cff4b4813062d2a3c5d72326bccae4d69c82 Mon Sep 17 00:00:00 2001
From: Andrea Adamczyk <PM\andrea.adamczyk@devel-6414.processmaker.hq>
Date: Thu, 14 Oct 2021 15:03:59 -0400
Subject: [PATCH] PMCORE-3421

---
 .../src/ProcessMaker/BusinessModel/Cases/InputDocument.php    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Cases/InputDocument.php b/workflow/engine/src/ProcessMaker/BusinessModel/Cases/InputDocument.php
index a2f76f27c..648067244 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Cases/InputDocument.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Cases/InputDocument.php
@@ -560,7 +560,9 @@ class InputDocument
             header("Content-Description: File Transfer");
 
             if ($fp = fopen($realPath, 'rb')) {
-                ob_end_clean();
+                if (ob_get_contents()) {
+                    ob_end_clean();
+                }
                 while (!feof($fp) and (connection_status() == 0)) {
                     print(fread($fp, 8192));
                     flush();