fix #4227

lib/commands.py

@@ -34,7 +34,7 @@ from functools import wraps
 from decimal import Decimal
 
 from .import util
-from .util import bfh, bh2u, format_satoshis, json_decode, print_error
+from .util import bfh, bh2u, format_satoshis, json_decode, print_error, json_encode
 from .import bitcoin
 from .bitcoin import is_address,  hash_160, COIN, TYPE_ADDRESS
 from .i18n import _
@@ -451,7 +451,7 @@ class Commands:
             from .exchange_rate import FxThread
             fx = FxThread(self.config, None)
             kwargs['fx'] = fx
-        return self.wallet.get_full_history(**kwargs)
+        return json_encode(self.wallet.get_full_history(**kwargs))
 
     @command('w')
     def setlabel(self, key, label):