This patch should not be required to import your Aperture library into Lightroom, and I don’t recommend using it. I wrote it when I was having problems with the import, but have since found the source of the problems fixable within the Aperture library. Please see my updated blog post at http://oyam.ca/blog/2014/10/aperture-importer.html. This g…

Import.lua

--- Import.lua.orig	2014-10-25 10:13:07.000000000 -0700
+++ Import.lua	2014-10-25 10:41:34.000000000 -0700
@@ -154,15 +154,15 @@
 
 	local kwdInf, outputPath, err = Utils.getKeywordInfo( aperturePkg, workDir )
 
-	if props.importOnlyUsedKeywords then	
+	if props.importOnlyUsedKeywords and kwdInf then	
 		for i, root in ipairs( kwdInf.keywords ) do
 			dropUnusedKeywords( root, kwdInf.keywords, i, kwdInf.usedKeywords )
 		end
 	end
 
-	kwdInf.usedKeywords = nil
-	
 	if kwdInf and outputPath then
+		kwdInf.usedKeywords = nil
+	
 		return processExtractedKeywordInfo( kwdInf, cat, logger )
 	else
 		logger:infof( "Failed to obtain keyword info from %s with error %s", aperturePkg, err )