502 Error when GET Projects from API with membership
### Summary When making a GET request to https://gitlab.com/api/v4/projects?membership=true&per_page=100&page=1 a 502 error is returned consistently. This request is failing when authenticated as @Cervajz via OAuth or Cookies in browser. This was detected from a GitLab OAuth integration, but the 502 error also occurs when @Cervajz visits the url in browser. ### Steps to reproduce Only returns 502 when authenticated as @Cervajz. To reproduce, visit the above API url in browser. ### What is the current *bug* behavior? 502 error response ### What is the expected *correct* behavior? 200 response ### Relevant logs and/or screenshots ![Screen_Shot_2018-05-04_at_8.27.27_AM](/uploads/aabaad168f680ee8fac23564971ae428/Screen_Shot_2018-05-04_at_8.27.27_AM.png) ### Output of checks This bug happens on GitLab.com
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