Cannot call method 'concat' of undefined At: http://orange:8091/js/analytics.js:229

Install couchbase server 2.0.0-1458 on 6 nodes centos 6.2
Create cluster of 6 nodes
Create default bucket and load 45+ million items to bucket.
Do swap rebalance one by one node.
I see a lot of error in log saying that:

Client-side error-report for user "Administrator" on node 'ns_1@10.3.121.13':
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5
Got unhandled error: Uncaught TypeError: Cannot call method 'concat' of undefined
At: http://orange:8091/js/analytics.js:229
Backtrace:
Function: collectBacktraceViaCaller
Args:

---------
Function: appOnError
Args:
"Uncaught TypeError: Cannot call method 'concat' of undefined"
"http://orange:8091/js/analytics.js"
229
---------

Link to diag from 3 node 10.3.121.13 10.3.121.14 10.3.121.15

https://s3.amazonaws.com/packages.couchbase/diag-logs/large_cluster_2_0/3nodes_13_14_13.tgz