diff --git a/lib/invoicing/line_item.rb b/lib/invoicing/line_item.rb
index a6ec46d..019d333 100644
--- a/lib/invoicing/line_item.rb
+++ b/lib/invoicing/line_item.rb
@@ -196,7 +196,8 @@ def initialize(*args)
     # Returns the currency code of the ledger item to which this line item belongs.
     def currency
       ledger_item = line_item_class_info.get(self, :ledger_item)
-      raise RuntimeError, 'Cannot determine currency for line item without a ledger item' if ledger_item.nil?
+      return if ledger_item.nil?
+
       ledger_item.send(:ledger_item_class_info).get(ledger_item, :currency)
     end