After installing plugin it's not possible to save settings

[imrahil]

1. What were you doing?
   Installed a plugin and tried to click save button on settings dialog
2. What did you expect to happen?
   Save settings and close a dialog
3. What happened instead?
   No response. In logs however I found detailed error:
   https://gist.github.com/imrahil/2e8d59604ca5490e99f5
4. Branch & Commit or Version of OctoPrint:
   devel or master - both are affected
5. Printer model & used firmware incl. version
   (if applicable - always include if unsure):
6. Browser and Version of Browser, Operating
   System running Browser (if applicable - always
   include if unsure):
   Firefox
7. Link to octoprint.log on gist.github.com or pastebin.com
   (ALWAYS INCLUDE AND DO NOT TRUNCATE):
   https://gist.github.com/imrahil/2e8d59604ca5490e99f5
8. Link to contents of terminal tab or serial.log on
   gist.github.com or pastebin.com (if applicable - always
   include if unsure or reporting communication issues AND
   DO NOT TRUNCATE):
9. Link to contents of Javascript console in the browser
   on gist.github.com or pastebin.com or alternatively a
   screenshot (if applicable - always include if unsure
   or reporting UI issues):
10. Screenshot(s) showing the problem (if applicable - always
    include if unsure or reporting UI issues):

I have read the FAQ.

[MrBreadWater]

Did you ever find a solution?