diff --git a/src/windows.py b/src/windows.py
index 790dd858..1ff8f858 100644
--- a/src/windows.py
+++ b/src/windows.py
@@ -138,7 +138,8 @@ class Win(object):
                 self._win.attron(curses.A_BOLD)
             if attr_char in string.digits and attr_char != '':
                 color_str = text[next_attr_char+1:text.find('}', next_attr_char)]
-                self._win.attron(to_curses_attr((int(color_str), -1)))
+                if color_str:
+                    self._win.attron(to_curses_attr((int(color_str), -1)))
                 text = text[next_attr_char+len(color_str)+2:]
             else:
                 text = text[next_attr_char+2:]