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-rw-r--r--repoze/bfg/chameleon_zpt.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/repoze/bfg/chameleon_zpt.py b/repoze/bfg/chameleon_zpt.py
index ca9e743e0..b6b3594cd 100644
--- a/repoze/bfg/chameleon_zpt.py
+++ b/repoze/bfg/chameleon_zpt.py
@@ -27,7 +27,7 @@ class ZPTTemplateRenderer(object):
def __call__(self, value, system):
try:
system.update(value)
- except TypeError:
+ except (TypeError, ValueError):
raise ValueError('renderer was passed non-dictionary as value')
result = self.template(**system)
return result