diff --git a/SeedDMS_Preview/Preview/Previewer.php b/SeedDMS_Preview/Preview/Previewer.php
index 33160489f..24d41baae 100644
--- a/SeedDMS_Preview/Preview/Previewer.php
+++ b/SeedDMS_Preview/Preview/Previewer.php
@@ -75,7 +75,9 @@ class SeedDMS_Preview_Previewer {
 		do {
 			$timeleft = $timeout - time();
 			$read = array($pipes[1]);
-			stream_select($read, $write = NULL, $exeptions = NULL, $timeleft, 200000);
+			$write = NULL;
+			$exeptions = NULL;
+			stream_select($read, $write, $exeptions, $timeleft, 200000);
 					 
 			if (!empty($read)) {
 				$output .= fread($pipes[1], 8192);