diff --git a/glances/plugins/glances_ip.py b/glances/plugins/glances_ip.py
index ad4b6e54..8a61127d 100644
--- a/glances/plugins/glances_ip.py
+++ b/glances/plugins/glances_ip.py
@@ -80,8 +80,7 @@ class Plugin(GlancesPlugin):
                     self.stats['mask_cidr'] = self.ip_to_cidr(self.stats['mask'])
                     self.stats['gateway'] = netifaces.gateways()['default'][netifaces.AF_INET][0]
                 except (KeyError, AttributeError) as e:
-                    logger.debug("Can not grab IP information (%s)".format(e))
-
+                    logger.debug("Cannot grab IP information: {0}".format(e))
         elif self.input_method == 'snmp':
             # Not implemented yet
             pass
diff --git a/glances/plugins/glances_plugin.py b/glances/plugins/glances_plugin.py
index 7929adf9..a57c5fdf 100644
--- a/glances/plugins/glances_plugin.py
+++ b/glances/plugins/glances_plugin.py
@@ -99,8 +99,7 @@ class GlancesPlugin(object):
         ret = None
         if self.args is not None and self.args.enable_history and self.get_items_history_list() is not None:
             init_list = [i['name'] for i in self.get_items_history_list()]
-            logger.debug("Stats history activated for plugin {0} (items: {0})".format(
-                self.plugin_name, init_list))
+            logger.debug("Stats history activated for plugin {0} (items: {1})".format(self.plugin_name, init_list))
             ret = {}
         return ret
 
@@ -108,8 +107,7 @@ class GlancesPlugin(object):
         """Reset the stats history (dict of list)."""
         if self.args is not None and self.args.enable_history and self.get_items_history_list() is not None:
             reset_list = [i['name'] for i in self.get_items_history_list()]
-            logger.debug("Reset history for plugin {0} (items: {0})".format(
-                self.plugin_name, reset_list))
+            logger.debug("Reset history for plugin {0} (items: {1})".format(self.plugin_name, reset_list))
             self.stats_history = {}
 
     def update_stats_history(self, item_name=''):