diff --git a/src/helpers/init-libcore.js b/src/helpers/init-libcore.js
index f1df2ee0..70e3e632 100644
--- a/src/helpers/init-libcore.js
+++ b/src/helpers/init-libcore.js
@@ -3,6 +3,7 @@
 import logger from 'logger'
 import invariant from 'invariant'
 import network from 'api/network'
+import { serializeError } from './errors'
 
 const lib = require('@ledgerhq/ledger-core')
 
@@ -96,7 +97,7 @@ const NJSHttpClient = new lib.NJSHttpClient({
       r.complete(urlConnection, null)
     } catch (err) {
       const urlConnection = createHttpConnection(res, err.message)
-      r.complete(urlConnection, { code: 0, message: err.message })
+      r.complete(urlConnection, { code: 0, message: JSON.stringify(serializeError(err)) })
     }
   },
 })
diff --git a/src/helpers/libcore.js b/src/helpers/libcore.js
index e42bf774..7628c4c8 100644
--- a/src/helpers/libcore.js
+++ b/src/helpers/libcore.js
@@ -11,8 +11,7 @@ import type { NJSAccount, NJSOperation } from '@ledgerhq/ledger-core/src/ledgerc
 
 import { isSegwitAccount } from 'helpers/bip32'
 import * as accountIdHelper from 'helpers/accountId'
-import { createCustomErrorClass } from './errors'
-
+import { createCustomErrorClass, deserializeError } from './errors'
 import { getAccountPlaceholderName, getNewAccountPlaceholderName } from './accountName'
 
 const NoAddressesFound = createCustomErrorClass('NoAddressesFound')
@@ -158,7 +157,11 @@ const coreSyncAccount = (core, account) =>
           (payload && payload.getString('EV_SYNC_ERROR_MESSAGE')) ||
           'Sync failed'
         ).replace(' (EC_PRIV_KEY_INVALID_FORMAT)', '')
-        reject(new Error(message))
+        try {
+          reject(deserializeError(JSON.parse(message)))
+        } catch (e) {
+          reject(message)
+        }
         return
       }
       if (