1 files changed, 2 insertions, 0 deletions
diff --git a/lib/dfatool.py b/lib/dfatool.py
index 3def392..66be4fd 100755
--- a/lib/dfatool.py
+++ b/lib/dfatool.py
@@ -15,6 +15,8 @@ def running_mean(x, N):
     return (cumsum[N:] - cumsum[:-N]) / N
 
 def is_numeric(n):
+    if n == None:
+        return False
     try:
         int(n)
         return True