Visit http://en.m.wikipedia.beta.wmflabs.org/wiki/Forty-seven_Roninsasasassa?mobileaction=beta
Click talk
See infinite ajax loader.
Uncaught TypeError: Cannot read property 'code' of undefined
Seems error response is not being sent to error handler.
Related to Ic1542c6e0dc566f0aa59c25d5042b16771edfc6a ?
Let's add a browser test for this.
Version: unspecified
Severity: normal