add a nil check within the network check (#954)

fixes #937
virgo-agent-toolkit · Jun 26, 2017 · a2d8bba · a2d8bba
1 parent 71e2bc4
commit a2d8bba
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/check/network.lua b/check/network.lua
@@ -87,8 +87,10 @@ function NetworkCheck:run(callback)
     checkResult:setError('No such interface: ' .. self.interface_name)
   else
     local usage = interface:usage()
-    for key, value in pairs(usage) do
-      checkResult:addMetric(key, nil, 'gauge', value, units[key])
+    if usage then
+      for key, value in pairs(usage) do
+        checkResult:addMetric(key, nil, 'gauge', value, units[key])
+      end
     end
   end