diff --git a/src/main.mjs b/src/main.mjs
index cab438f..6d8adc0 100644
--- a/src/main.mjs
+++ b/src/main.mjs
@@ -100,6 +100,8 @@ Hooks.once("init", async function() {
     
     Handlebars.registerHelper({
         DSA41_input: (field_name, options) => {
+            field_name = field_name.toString();
+            
             let fields = field_name.startsWith("system.") ? options.data.root.document.system.schema.fields : options.data.root.document.schema.fields;
             let field = foundry.utils.getProperty(fields, field_name.replace(/^(system\.)/, "").replace(".", ".fields."));