diff --git a/tab.py b/tab.py
index 886587b..a77470f 100644
--- a/tab.py
+++ b/tab.py
@@ -364,9 +364,9 @@ class StackTabber2(Tabber):
     def _is_close_token(self, t):
         return t.string in self.close_tokens.get(t.name, set())
     def _handle_close_token(self, y, tokens, start, end, i, t):
-        if not self.stack:
-            raise Exception, "unmatched %r, line %d" % (t.string, y)
         while True:
+            if not self.stack:
+                raise Exception, "unmatched %r, line %d" % (t.string, y)
             marker = self.stack[-1]
             if marker.name in ('control', 'continue'):
                 self.stack.pop()