diff --git a/glances/core/glances_processes.py b/glances/core/glances_processes.py
index 6c051c56..705b51be 100644
--- a/glances/core/glances_processes.py
+++ b/glances/core/glances_processes.py
@@ -95,7 +95,10 @@ class GlancesProcesses(object):
         procstat['status'] = str(proc.status())[:1].upper()
 
         # Process nice
-        procstat['nice'] = proc.nice()
+        try:
+            procstat['nice'] = proc.nice()
+        except psutil.AccessDenied:
+            procstat['nice'] = None
 
         # Process memory
         procstat['memory_info'] = proc.memory_info()
diff --git a/glances/plugins/glances_processlist.py b/glances/plugins/glances_processlist.py
index 93f0ddfe..74cf34b8 100644
--- a/glances/plugins/glances_processlist.py
+++ b/glances/plugins/glances_processlist.py
@@ -146,6 +146,8 @@ class Plugin(GlancesPlugin):
             ret.append(self.curse_add_line(msg))
             # NICE
             nice = p['nice']
+            if nice is None:
+                nice = '?'
             msg = '{0:>5}'.format(nice)
             if nice != 0:
                 ret.append(self.curse_add_line(msg, decoration='NICE'))