Can not switch back to scan when exit from Gallery.

Information:
phablet@ubuntu-phablet:~$ system-image-cli -i
current build number: 413
device name: krillin
channel: ubuntu-touch/rc-proposed/bq-aquaris.en
last update: 2016-08-23 14:49:50
version version: 413
version ubuntu: 20160823
version device: 20160606-ab415b2
version custom: 20160805-985-38-15

Precondition:
None.

Path:
1. Launch Tagger app
2. Press the Gallery icon on the top right corner
3. On the Gallery Events page, press the "X" icon

Actual result:
Scan code page stay blank status, can not switch to scan anymore.

Expect result:
After back from Gallery, can launch to scan normal.