diff --git a/lib/getopt.ps1 b/lib/getopt.ps1
index 2f6ef3df15..0b04314f10 100644
--- a/lib/getopt.ps1
+++ b/lib/getopt.ps1
@@ -25,6 +25,7 @@ function getopt($argv, $shortopts, $longopts) {
 
     for($i = 0; $i -lt $argv.length; $i++) {
         $arg = $argv[$i]
+        if($null -eq $arg) { continue }
         # don't try to parse array arguments
         if($arg -is [array]) { $rem += ,$arg; continue }
         if($arg -is [int]) { $rem += $arg; continue }