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-rw-r--r--ext/syck/lib/syck/rubytypes.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/syck/lib/syck/rubytypes.rb b/ext/syck/lib/syck/rubytypes.rb
index 90f1cbfacf..eeef156e27 100644
--- a/ext/syck/lib/syck/rubytypes.rb
+++ b/ext/syck/lib/syck/rubytypes.rb
@@ -10,7 +10,7 @@ end
class Object
yaml_as "tag:ruby.yaml.org,2002:object"
def to_yaml_style; end
- undef to_yaml_properties
+ undef to_yaml_properties rescue nil
def to_yaml_properties; instance_variables.sort; end
def to_yaml( opts = {} )
YAML::quick_emit( self, opts ) do |out|