diff --git a/src/Spout/Common/Helper/GlobalFunctionsHelper.php b/src/Spout/Common/Helper/GlobalFunctionsHelper.php
index dd4356e..c5d6e31 100644
--- a/src/Spout/Common/Helper/GlobalFunctionsHelper.php
+++ b/src/Spout/Common/Helper/GlobalFunctionsHelper.php
@@ -260,7 +260,9 @@ class GlobalFunctionsHelper
      */
     public function ob_end_clean()
     {
-        ob_end_clean();
+        if (ob_get_length() > 0) {
+            ob_end_clean();
+        }
     }
 
     /**