update README

README.md

@@ -23,7 +23,7 @@ When a template has been opened in Inkscape before this extension is run, it wil
 
 Templates can predefine a single or multiple areas were the bingo numbers should be placed in.
 
-Create a rectangle and set the id-attribute to `bingo-area`. For multiple areas append numbers to the id such as `bingo-area_1`.
+Create a rectangle and set the id-attribute to `bingo-area`. For multiple areas append numbers to the id such as `bingo-area_1`. Clones of rectangles can also be used as bingo-areas.
 
 Use Inkscapes XML-Editor to add following attributes to the bingo-area-rectangle (optional):
 

bingo/bingo.py

@@ -87,6 +87,8 @@ def generate(self):
                 if bingo_field.tag_name == "use":
                     bingo_clone = bingo_field
                     bingo_field = self._get_clone_origin(bingo_field)
+                    if not bingo_field.tag_name == "rect":
+                        continue
 
                 # get template params
                 # params of first bingo field will also be used for the others - if not defined specifically