1 files changed, 16 insertions, 5 deletions
diff --git a/packages/web-util/src/forms/converter.ts b/packages/web-util/src/forms/converter.ts
index 3a522bf7e..eee891776 100644
--- a/packages/web-util/src/forms/converter.ts
+++ b/packages/web-util/src/forms/converter.ts
@@ -53,6 +53,15 @@ function parseAmlState(s: string | undefined): TalerExchangeApi.AmlState {
   }
 }
 
+const nullConverter: StringConverter<string> = {
+  fromStringUI(v: string | undefined): string {
+    return v ?? "";
+  },
+  toStringUI(v: unknown): string {
+    return v as string;
+  },
+};
+
 function amountConverter(config: any): StringConverter<AmountJson> {
   const currency = config["currency"];
   if (!currency || typeof currency !== "string") {
@@ -61,7 +70,9 @@ function amountConverter(config: any): StringConverter<AmountJson> {
   return {
     fromStringUI(v: string | undefined): AmountJson {
       // FIXME: requires currency
-      return Amounts.parse(`${currency}:${v}`) ?? Amounts.zeroOfCurrency(currency);
+      return (
+        Amounts.parse(`${currency}:${v}`) ?? Amounts.zeroOfCurrency(currency)
+      );
     },
     toStringUI(v: unknown): string {
       return v === undefined ? "" : Amounts.stringifyValue(v as AmountJson);
@@ -82,7 +93,7 @@ function absTimeConverter(config: any): StringConverter<AbsoluteTime> {
       try {
         const time = parse(v, pattern, new Date());
         return AbsoluteTime.fromMilliseconds(time.getTime());
-      } catch(e) {
+      } catch (e) {
         return AbsoluteTime.never();
       }
     },
@@ -91,9 +102,9 @@ function absTimeConverter(config: any): StringConverter<AbsoluteTime> {
       const d = v as AbsoluteTime;
       if (d.t_ms === "never") return "never";
       try {
-        return format(d.t_ms, pattern)
+        return format(d.t_ms, pattern);
       } catch (e) {
-        return ""
+        return "";
       }
     },
   };
@@ -115,5 +126,5 @@ export function getConverterById(
     // @ts-expect-error check this
     return amlStateConverter;
   }
-  return undefined!;
+  return nullConverter as StringConverter<unknown>;
 }