panic=runtime error: invalid memory address or nil pointer dereference stack=goroutine 8540

Test which fails:
tuqquery.tuq_2i_index.QueriesIndexTests.test_simple_array_index

Error seen after test finished:
CBQError: CBQError: host 172.23.106.234: ERROR:{u'status': u'stopped', u'errors': [

], u'results': [], u'metrics':

, u'requestID': u'927728ec-9507-4d9e-9423-9a06a4b1ddc0', u'signature': {u'name': u'json'}}

Error in query log:
_time=2016-07-05T13:13:30.577-07:00 _level=ERROR _msg= panic=runtime error: invalid memory address or nil pointer dereference stack=goroutine 8540 [running]:
github.com/couchbase/query/execution.(*Context).Recover(0xc208d0c1e0)
/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/context.go:341 +0xb5 fp=0xc208569550 sp=0xc2085693d0
runtime.call16(0x13c1390, 0xc2082b4df0, 0x800000008)
/usr/local/go/src/runtime/asm_amd64.s:401 +0x45 fp=0xc208569568 sp=0xc208569550
runtime.gopanic(0xf18b20, 0xc20802a050)
/usr/local/go/src/runtime/panic.go:387 +0x3a8 fp=0xc2085695d0 sp=0xc208569568
runtime.panicmem()
/usr/local/go/src/runtime/panic.go:42 +0x4e fp=0xc2085695f8 sp=0xc2085695d0
runtime.sigpanic()
/usr/local/go/src/runtime/sigpanic_unix.go:26 +0x274 fp=0xc208569648 sp=0xc2085695f8
github.com/couchbase/query/execution.(*PrimaryScan).scanEntries(0xc2083ca000, 0xc208d0c1e0, 0xc208352930)
/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/scan_primary.go:190 +0x3f4 fp=0xc2085697c8 sp=0xc208569648
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2232 +0x1 fp=0xc2085697d0 sp=0xc2085697c8
created by github.com/couchbase/query/execution.(*PrimaryScan).scanPrimary
/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/scan_primary.go:70 +0x14d

goroutine 8540 [running]:
github.com/couchbase/query/execution.(*Context).Recover(0xc208d0c1e0)
/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/context.go:341 +0xb5 fp=0xc208569550 sp=0xc2085693d0
runtime.call16(0x13c1390, 0xc2082b4df0, 0x800000008)
/usr/local/go/src/runtime/asm_amd64.s:401 +0x45 fp=0xc208569568 sp=0xc208569550
runtime.gopanic(0xf18b20, 0xc20802a050)
/usr/local/go/src/runtime/panic.go:387 +0x3a8 fp=0xc2085695d0 sp=0xc208569568
runtime.panicmem()
/usr/local/go/src/runtime/panic.go:42 +0x4e fp=0xc2085695f8 sp=0xc2085695d0
runtime.sigpanic()
/usr/local/go/src/runtime/sigpanic_unix.go:26 +0x274 fp=0xc208569648 sp=0xc2085695f8
github.com/couchbase/query/execution.(*PrimaryScan).scanEntries(0xc2083ca000, 0xc208d0c1e0, 0xc208352930)
/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/scan_primary.go:190 +0x3f4 fp=0xc2085697c8 sp=0xc208569648
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2232 +0x1 fp=0xc2085697d0 sp=0xc2085697c8
created by github.com/couchbase/query/execution.(*PrimaryScan).scanPrimary
/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/query/execution/scan_primary.go:70 +0x14d
2016-07-05T13:13:30.641-07:00 [Info] DropIndex 755579409405662061 - elapsed(48.817794ms), err(<nil>)
_time=2016-07-05T13:13:30.730-07:00 _level=WARN _msg=Finalizing a bucket with active connections.
2016-07-05T13:13:30.830-07:00 [Info] DropIndex 16922473800539061598 - elapsed(46.668043ms), err(<nil>)
2016-07-05T13:13:31.255-07:00 [Info] serviceChangeNotifier: received PoolChangeNotification
2016-07-05T13:13:31.284-07:00 [Info] Refreshing indexer list due to cluster changes or auto-refresh.

Logs are attached.

How to run the test?
python testrunner.py -i test.ini -c conf/tuq/py-tuq-arrayindexing.conf -p gsi_type=forestdb -p array_indexing=True -p primary_indx_type=GSI,doc-per-day=6,nodes_init=4