From 42241de6993dc41e59cfe5a8b37d8c023ff46d9e Mon Sep 17 00:00:00 2001
From: Erik Huelsmann <ehuels@gmail.com>
Date: Sun, 6 Aug 2023 12:48:31 +0200
Subject: [PATCH] Updating the context with an 'undef' value removes the
 parameter from the context

---
 lib/Workflow/Base.pm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/Workflow/Base.pm b/lib/Workflow/Base.pm
index a756a40..811fa71 100644
--- a/lib/Workflow/Base.pm
+++ b/lib/Workflow/Base.pm
@@ -38,7 +38,12 @@ sub param {
 
     if ( ref $name eq 'HASH' ) {
         foreach my $param_name ( keys %{$name} ) {
-            $self->{PARAMS}{$param_name} = $name->{$param_name};
+            if (defined $name->{$param_name}) {
+                $self->{PARAMS}{$param_name} = $name->{$param_name};
+            }
+            else {
+                delete $self->{PARAMS}->{$param_name};
+            }
         }
         return { %{ $self->{PARAMS} } };
     }