check for cashAdrr in isValidRecipient

src/libcore/isValidRecipient.js

@@ -1,6 +1,6 @@
 // @flow
 
-import { InvalidAddress } from "@ledgerhq/errors";
+import { InvalidAddress, CashAddrNotSupported } from "@ledgerhq/errors";
 import type { CryptoCurrency } from "../types";
 import { withLibcoreF } from "./access";
 import customAddressValidationByFamily from "../generated/customAddressValidation";
@@ -24,6 +24,10 @@ export const isValidRecipient: F = withLibcoreF(core => async arg => {
     return Promise.resolve(null);
   }
 
+  if (recipient.startsWith("bitcoincash:")) {
+    return Promise.reject(new CashAddrNotSupported());
+  }
+
   return Promise.reject(
     new InvalidAddress(null, { currencyName: currency.name })
   );