diff --git a/logbot.py b/logbot.py
index b7cc694..3bc5dd1 100755
--- a/logbot.py
+++ b/logbot.py
@@ -198,6 +198,8 @@ def replace_color(code, text):
         '36': '00aaaa',
         '37': 'F5F1DE',
     }
+    if code not in colors:
+        return text
     return '<span style="color: #%(color)s">%(text)s</span>' % dict(
         color = colors[code],
         text = text,