diff --git a/asciichartpy/__init__.py b/asciichartpy/__init__.py
index de642d4..0ee9593 100644
--- a/asciichartpy/__init__.py
+++ b/asciichartpy/__init__.py
@@ -22,6 +22,13 @@ def plot(series, cfg={}):
     minimum = cfg['minimum'] if 'minimum' in cfg else min(series)
     maximum = cfg['maximum'] if 'maximum' in cfg else max(series)
 
+
+# for series with one elements or fill with the same value 
+# not the perfect solution but it works    
+    if minimum == maximum :
+        maximum += 0.00001
+
+
     interval = abs(float(maximum) - float(minimum))
     offset = cfg['offset'] if 'offset' in cfg else 3
     padding = cfg['padding'] if 'padding' in cfg else '           '