--- a/util/datamanager.lua	Fri Feb 20 15:51:05 2015 +0000
+++ b/util/datamanager.lua	Fri Feb 20 19:00:01 2015 +0100
@@ -163,7 +163,7 @@
 	return nil, msg;
 end
 
-if prosody.platform ~= "posix" then
+if prosody and prosody.platform ~= "posix" then
 	-- os.rename does not overwrite existing files on Windows
 	-- TODO We could use Transactional NTFS on Vista and above
 	function atomic_store(filename, data)