diff --git a/functions/TagWithCreator/run.ps1 b/functions/TagWithCreator/run.ps1
index 88de348..1a5de83 100644
--- a/functions/TagWithCreator/run.ps1
+++ b/functions/TagWithCreator/run.ps1
@@ -30,7 +30,7 @@ foreach ($case in $ignore) {
 
 $tags = (Get-AzTag -ResourceId $resourceId).Properties
 
-if (!($tags.TagsProperty.ContainsKey('Creator')) -or ($null -eq $tags)) {
+if (($null -eq $tags.TagsProperty) -or !($tags.TagsProperty.ContainsKey('Creator')) ) {
     $tag = @{
         Creator = $caller
     }