Show more lines does not work in a PR

I clicked on show more lines on a PR that was merged and the UI does not unwrap to shoe more lines. I see 500 errors in the console

GET https://bitbucket.org/!api/1.0/repositories/atlassian/engage-targeting/pullrequests/230/_context/module-targeting/src/main/java/com/atlassian/engage/targeting/translation/TranslationRest.java?below_fnum=26&below_tnum=23&above_fnum=55&above_tnum=52 500
(anonymous) @ VM370:1
nrWrapper @ VM402 230:34
(anonymous) @ raven.js?ae06***:1348
(anonymous) @ raven.js?ae06:1348
send @ jquery.js:8630
ajax @ jquery.js:8166
f.expand @ context-expander.js?2565:84
o @ jquery.js:512
dispatch @ jquery.js:4435
g.handle @ jquery.js:4121
r @ raven.js?ae06:377
nrWrapper @ VM402 230:34