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-rw-r--r--actionpack/lib/action_dispatch/routing/deprecated_mapper.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/routing/deprecated_mapper.rb b/actionpack/lib/action_dispatch/routing/deprecated_mapper.rb
index dd76391870..87dfaba6c7 100644
--- a/actionpack/lib/action_dispatch/routing/deprecated_mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/deprecated_mapper.rb
@@ -175,7 +175,7 @@ module ActionDispatch
optional = false
elsif segment =~ /^:(\w+)$/
if defaults.has_key?($1.to_sym)
- defaults.delete($1.to_sym)
+ defaults.delete($1.to_sym) if defaults[$1.to_sym].nil?
else
optional = false
end