From: Tim Vieira <tim.f.vieira@gmail.com>
Date: Sat, 6 Jul 2013 04:12:28 +0000 (-0400)
Subject: might error when retracting a BC rule.
X-Git-Url: https://hydra-www.ietfng.org/gitweb/?a=commitdiff_plain;h=7530e9d981e1842462a019acd5411bf16617c597;p=dyna2

might error when retracting a BC rule.
---

diff --git a/src/Dyna/Backend/Python/interpreter.py b/src/Dyna/Backend/Python/interpreter.py
index 19dfd5d..87dcbb1 100644
--- a/src/Dyna/Backend/Python/interpreter.py
+++ b/src/Dyna/Backend/Python/interpreter.py
@@ -350,7 +350,11 @@ class Interpreter(object):
                     def _emit(item, val, ruleix, variables):
                         item.aggregator.dec(val, ruleix, variables)
 
-                    rule.query(*head.args, emit=_emit)
+                    try:
+                        rule.query(*head.args, emit=_emit)
+                    except (TypeError, ZeroDivisionError):
+                        pass
+
                     self.agenda[head] = time()
 
         return self.go()