diff --git a/include/dokument_export.class.php b/include/dokument_export.class.php
index e6628ceaa..3b5b76b21 100644
--- a/include/dokument_export.class.php
+++ b/include/dokument_export.class.php
@@ -48,7 +48,13 @@ class dokument_export
 
 		exec('unoconv --version',$ret_arr);
 		if(isset($ret_arr[0]))
-			$this->unoconv_version = explode(' ',$ret_arr[0])[1];
+		{
+			$hlp = explode(' ',$ret_arr[0]);
+			if(isset($hlp[1]))
+				$this->unoconv_version = $hlp[1];
+			else
+				die('Could not get Unoconv Version');
+		}
 		else
 			die('Unoconv not found');