{"action":"opened","issue":{"url":"https://api.github.com/repos/tidyverse/ggplot2/issues/1928","repository_url":"https://api.github.com/repos/tidyverse/ggplot2","labels_url":"https://api.github.com/repos/tidyverse/ggplot2/issues/1928/labels{/name}","comments_url":"https://api.github.com/repos/tidyverse/ggplot2/issues/1928/comments","events_url":"https://api.github.com/repos/tidyverse/ggplot2/issues/1928/events","html_url":"https://github.com/tidyverse/ggplot2/issues/1928","id":191884612,"number":1928,"title":"facet_grid(a ~ a) produces an error","user":{"login":"vnijs","id":2998956,"avatar_url":"https://avatars.githubusercontent.com/u/2998956?v=3","gravatar_id":"","url":"https://api.github.com/users/vnijs","html_url":"https://github.com/vnijs","followers_url":"https://api.github.com/users/vnijs/followers","following_url":"https://api.github.com/users/vnijs/following{/other_user}","gists_url":"https://api.github.com/users/vnijs/gists{/gist_id}","starred_url":"https://api.github.com/users/vnijs/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vnijs/subscriptions","organizations_url":"https://api.github.com/users/vnijs/orgs","repos_url":"https://api.github.com/users/vnijs/repos","events_url":"https://api.github.com/users/vnijs/events{/privacy}","received_events_url":"https://api.github.com/users/vnijs/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-11-27T20:47:24Z","updated_at":"2016-11-27T20:47:24Z","closed_at":null,"body":"FYI The example from #1153 now produces the error below and does not create a plot\r\n\r\n```r\r\nggplot(data.frame(a = letters[1:3], y = rnorm(3))) + geom_point(aes(y, y)) + facet_grid(a~a)\r\n\r\n> Error in scale_apply(layer_data, x_vars, \"train\", SCALE_X, x_scales) : \r\n```"}}
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