Fix error string type.

diff --git a/src/assembly/errors.ts b/src/assembly/errors.ts
index 2dd6be1e820fd14d8b6b92f56a6a757627f195cf..c318d9ebcb88dec43c74983d7c3f1627a72b0ddb 100644 (file)
--- a/src/assembly/errors.ts
+++ b/src/assembly/errors.ts
@@ -2,7 +2,7 @@
 //! SPDX-License-Identifier: GPL-3.0-or-later
 
 export const errors = [
-    null,
+    '',
     'Invalid public key',
     'Invalid message length',
     'Invalid block count'