diff --git a/Tests/Manual/RuntimeAttributesTest/Resources/MainMenu.xib b/Tests/Manual/RuntimeAttributesTest/Resources/MainMenu.xib
index 6b666688b..c1594db54 100644
--- a/Tests/Manual/RuntimeAttributesTest/Resources/MainMenu.xib
+++ b/Tests/Manual/RuntimeAttributesTest/Resources/MainMenu.xib
@@ -533,6 +533,17 @@ SW5pdGlhbEZpcnN0UmVzcG9uZGVyIG1ldGhvZA</string>
 								<string key="keyPath">initialResponder</string>
 								<real value="2" key="value"/>
 							</object>
+							<object class="IBUserDefinedRuntimeAttribute">
+								<string key="typeIdentifier">com.apple.InterfaceBuilder.userDefinedRuntimeAttributeType.string</string>
+								<string key="keyPath">localized</string>
+								<string key="value">foo</string>
+								<bool key="localized">YES</bool>
+							</object>
+							<object class="IBUserDefinedRuntimeAttribute">
+								<string key="typeIdentifier">com.apple.InterfaceBuilder.userDefinedRuntimeAttributeType.nil</string>
+								<string key="keyPath">null</string>
+								<nil key="value"/>
+							</object>
 						</array>
 					</object>
 				</object>
diff --git a/Tools/nib2cib/NSNibConnector.j b/Tools/nib2cib/NSNibConnector.j
index 4a3162021..5e49ff64a 100644
--- a/Tools/nib2cib/NSNibConnector.j
+++ b/Tools/nib2cib/NSNibConnector.j
@@ -54,7 +54,8 @@ NIB_CONNECTION_EQUIVALENCY_TABLE = {};
             _destination = NIB_CONNECTION_EQUIVALENCY_TABLE[destinationUID];
         }
 
-        CPLog.debug(@"Connection: " + [_source description] + " " + [_destination description] + " " + _label);
+        if (_source && _destination)
+            CPLog.debug(@"Connection: " + [_source description] + " " + [_destination description] + " " + _label);
     }
 
     return self;
@@ -180,6 +181,13 @@ var NSTramsformers = [CPSet setWithObjects:
         _source = [aCoder decodeObjectForKey:@"NSObject"];
         _keyPaths = [aCoder decodeObjectForKey:@"NSKeyPaths"];
         _values = [aCoder decodeObjectForKey:@"NSValues"];
+
+        var count = [_keyPaths count];
+
+        CPLog.debug(@"Runtime Attributes Connector: " + [_source description]);
+
+        while (count--)
+            CPLog.debug(@"   %s (%s): %s", _keyPaths[count], [_values[count] className], _values[count]);
     }
 
     return self;