diff --git a/lbrynet/conf.py b/lbrynet/conf.py
index 744bec931..eef403fd0 100644
--- a/lbrynet/conf.py
+++ b/lbrynet/conf.py
@@ -159,10 +159,11 @@ class Path(String):
 class MaxKeyFee(Setting[dict]):
 
     def validate(self, value):
-        assert isinstance(value, dict) and set(value) == {'currency', 'amount'}, \
-            f"Setting '{self.name}' must be a dict like \"{{'amount': 50.0, 'currency': 'USD'}}\"."
-        if value["currency"] not in CURRENCIES:
-            raise InvalidCurrencyError(value["currency"])
+        if value is not None:
+            assert isinstance(value, dict) and set(value) == {'currency', 'amount'}, \
+                f"Setting '{self.name}' must be a dict like \"{{'amount': 50.0, 'currency': 'USD'}}\"."
+            if value["currency"] not in CURRENCIES:
+                raise InvalidCurrencyError(value["currency"])
 
     @staticmethod
     def _parse_list(l):
diff --git a/lbrynet/extras/cli.py b/lbrynet/extras/cli.py
index dce3f818c..9205910dd 100644
--- a/lbrynet/extras/cli.py
+++ b/lbrynet/extras/cli.py
@@ -176,7 +176,7 @@ def get_argument_parser():
         help='Show lbrynet CLI version and exit.'
     )
     main.set_defaults(group=None, command=None)
-    CLIConfig.contribute_args(main)
+    CLIConfig.contribute_to_argparse(main)
     sub = main.add_subparsers(metavar='COMMAND')
     start = sub.add_parser(
         'start',
@@ -193,7 +193,7 @@ def get_argument_parser():
               'should selectively be applied.')
     )
     start.set_defaults(command='start', start_parser=start)
-    Config.contribute_args(start)
+    Config.contribute_to_argparse(start)
 
     api = Daemon.get_api_definitions()
     groups = {}
diff --git a/lbrynet/extras/daemon/Daemon.py b/lbrynet/extras/daemon/Daemon.py
index 0d9051569..910f65899 100644
--- a/lbrynet/extras/daemon/Daemon.py
+++ b/lbrynet/extras/daemon/Daemon.py
@@ -766,7 +766,6 @@ class Daemon(metaclass=JSONRPCServerType):
                          [--download_timeout=<download_timeout>]
                          [--peer_port=<peer_port>]
                          [--max_key_fee=<max_key_fee>]
-                         [--disable_max_key_fee=<disable_max_key_fee>]
                          [--use_upnp=<use_upnp>]
                          [--run_reflector_server=<run_reflector_server>]
                          [--cache_time=<cache_time>]
@@ -787,9 +786,9 @@ class Daemon(metaclass=JSONRPCServerType):
                                                             'currency': <currency_symbol>,
                                                             'amount': <amount>
                                                           }.
-                                                          In the CLI, it must be an escaped JSON string
+                                                          In the CLI, it must be: '<amount> <currency>'
                                                           Supported currency symbols: LBC, USD, BTC
-            --disable_max_key_fee=<disable_max_key_fee> : (bool) False
+            --no_max_key_fee                 : (bool) Disable max key fee.
             --use_upnp=<use_upnp>            : (bool) True
             --run_reflector_server=<run_reflector_server>  : (bool) False
             --cache_time=<cache_time>  : (int) 150
diff --git a/tests/unit/test_conf.py b/tests/unit/test_conf.py
index ff750fb11..ba0cb1fec 100644
--- a/tests/unit/test_conf.py
+++ b/tests/unit/test_conf.py
@@ -196,6 +196,10 @@ class ConfigurationTests(unittest.TestCase):
                 c.max_key_fee = {'currency': 'BTC', 'amount': 1}
             with open(config, 'r') as fd:
                 self.assertEqual(fd.read(), 'max_key_fee:\n  amount: 1\n  currency: BTC\n')
+            with c.update_config():
+                c.max_key_fee = None
+            with open(config, 'r') as fd:
+                self.assertEqual(fd.read(), 'max_key_fee: null\n')
 
     def test_max_key_fee_from_args(self):
         parser = argparse.ArgumentParser()