diff --git a/services/document-updater/app/coffee/RedisManager.coffee b/services/document-updater/app/coffee/RedisManager.coffee
index 257b889680..2e59fefd57 100644
--- a/services/document-updater/app/coffee/RedisManager.coffee
+++ b/services/document-updater/app/coffee/RedisManager.coffee
@@ -130,12 +130,15 @@ module.exports = RedisManager =
 			return callback(error) if error?
 			[lines, version, ops, project_id] = results
 			multi = rclient.multi()
-			multi.set keys.docLines(doc_id:doc_id), lines
-			multi.set keys.docVersion(doc_id:doc_id), version
+			if lines?
+				multi.set keys.docLines(doc_id:doc_id), lines
+			if version?
+				multi.set keys.docVersion(doc_id:doc_id), version
 			multi.del keys.docOps(doc_id:doc_id)
 			if ops.length > 0
 				multi.rpush keys.docOps(doc_id:doc_id), ops...
-			multi.set keys.projectKey(doc_id:doc_id), project_id
+			if project_id?
+				multi.set keys.projectKey(doc_id:doc_id), project_id
 			multi.exec (error) ->
 				return callback(error) if error?
 				return callback null, project_id
@@ -143,4 +146,7 @@ module.exports = RedisManager =
 	getAndSetProject: (project_id, callback = (error) ->) ->
 		rclient.smembers keys.docsInProject(project_id: project_id), (error, doc_ids) ->
 			return callback(error) if error?
-			rclient.sadd keys.docsInProject(project_id: project_id), doc_ids..., callback
+			if doc_ids.length > 0
+				rclient.sadd keys.docsInProject(project_id: project_id), doc_ids..., callback
+			else
+				callback()
diff --git a/services/document-updater/migrate.coffee b/services/document-updater/migrate.coffee
index 13f20e50c2..d0ede23a22 100644
--- a/services/document-updater/migrate.coffee
+++ b/services/document-updater/migrate.coffee
@@ -2,6 +2,8 @@ RedisManager = require "./app/coffee/RedisManager"
 UpdateManager = require "./app/coffee/UpdateManager"
 LockManager = require "./app/coffee/LockManager"
 
+async = require "async"
+
 handleErrorInsideLock = (doc_id, lockValue, original_error, callback = (error) ->) ->
 	LockManager.releaseLock doc_id, lockValue, (lock_error) ->
 		callback(original_error)
@@ -17,13 +19,18 @@ migrateDoc = (doc_id, callback = (error) ->) ->
 					return callback(error) if error?
 					UpdateManager.continueProcessingUpdatesWithLock project_id, doc_id, callback
 
-doc_id = process.argv[2]
-if !doc_id?
-	console.log "Usage: coffee migrate.coffee DOC_ID"
+doc_ids = process.argv.slice(2)
+if doc_ids.length == 0
+	console.log "Usage: coffee migrate.coffee DOC_ID [DOC_ID ...]"
 	process.exit(1)
 
-migrateDoc doc_id, (error) ->
+jobs = []
+for doc_id in doc_ids
+	do (doc_id) ->
+		jobs.push (cb) ->
+			console.log "MIGRATING #{doc_id}"
+			migrateDoc doc_id, cb
+
+async.series jobs, (error) ->
 	throw error if error?
-	setTimeout () ->
-		process.exit(0)
-	, 200
\ No newline at end of file
+	process.exit(0)