diff --git a/wifi/bornes.py b/wifi/bornes.py
index 2a5e396a..24f47f5f 100755
--- a/wifi/bornes.py
+++ b/wifi/bornes.py
@@ -62,7 +62,7 @@ def bornes_canal():
         if 'Current Channel' in curoutput:
             results[name] = curoutput.split(':')[-1].strip()
         else:
-            results[name] = '0'
+            results[name] = None
         output.close()
     return results
 
@@ -82,8 +82,10 @@ def bornes_clients():
     # On lit tout les résultats:
     results = {}
     for name, output in outputs.iteritems():
-        macs = map(lambda x: x.split(), output.readlines())
-        results[name] = str(len([x for x in macs if x[0] == '2' and x[2] != 'yes']))
+        lines = output.readlines()
+        if lines:
+            macs = map(lambda x: x.split(), lines)
+            results[name] = str(len([x for x in macs if x[0] == '2' and x[2] != 'yes']))
         output.close()
     return results
 
@@ -144,9 +146,11 @@ def munin(config, cmd=None, process=(lambda x: x), results=None, buckets=None, s
         bins = {}
         for (lbl, val) in buckets.iteritems(): bins[val] = 0
     for name, res in results.iteritems():
-        value = process(res).split('\n', 1)[0].strip()
-        if buckets: bins[buckets[value]] += 1
-        else: print '%s.value %s' % (name, value)
+        try:
+            value = process(res).split('\n', 1)[0].strip()
+            if buckets: bins[buckets[value]] += 1
+            else: print '%s.value %s' % (name, value)
+        except: pass
 
     if buckets:
         for name, res in bins.iteritems():
@@ -215,7 +219,7 @@ graph_args --base 1000 -l 0
 graph_vlabel uptime in days"""
             def process(uptime):
                 if uptime: return str(float (uptime.split()[1]) / (24 * 3600))
-                else: return '0'
+                else: return None
             munin(config, cmd = 'cat /proc/uptime', process=process)
         elif plugin == 'clients':
             config = """graph_title Clients connectés