diff --git a/lib/kiba/extend/transforms/replace.rb b/lib/kiba/extend/transforms/replace.rb
index eb885249d..8d0534447 100644
--- a/lib/kiba/extend/transforms/replace.rb
+++ b/lib/kiba/extend/transforms/replace.rb
@@ -33,7 +33,12 @@ def initialize(source:, target:, mapping:, fallback_val: :orig, delete_source: t
           end
 
           def process(row)
-            origval = @multival ? row.fetch(@source).split(@sep) : [row.fetch(@source)]
+            rowval = row.fetch(@source, nil)
+            if rowval.nil?
+              origval = [rowval]
+            else
+              origval = @multival ? row.fetch(@source).split(@sep) : [row.fetch(@source)]
+            end
             newvals = []
             
             origval.each do |oval|
diff --git a/lib/kiba/extend/version.rb b/lib/kiba/extend/version.rb
index b0793aeda..ab3206370 100644
--- a/lib/kiba/extend/version.rb
+++ b/lib/kiba/extend/version.rb
@@ -1,5 +1,5 @@
 module Kiba
   module Extend
-    VERSION = "1.4.0"
+    VERSION = "1.4.1"
   end
 end