Pull failed

When trying to pull an article from source the program gives this critical error:

[JavaFX Application Thread] ERROR ee.translate.keeleleek.mtapplication.controller.plugins.RequestPullCommand - Pull failed java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.rangeCheck(ArrayList.java:653) at java.util.ArrayList.set(ArrayList.java:444) at ee.translate.keeleleek.mtapplication.controller.actions.EntitiesAction.toList(EntitiesAction.java:153) at ee.translate.keeleleek.mtapplication.controller.actions.EntitiesAction.<init>(EntitiesAction.java:43) at ee.translate.keeleleek.mtapplication.model.plugins.CopyReplacePastePlugin.fetch(CopyReplacePastePlugin.java:296) at ee.translate.keeleleek.mtapplication.model.plugins.CopyReplacePastePlugin.translateWikilinks(CopyReplacePastePlugin.java:117) at ee.translate.keeleleek.mtapplication.model.plugins.CopyReplacePastePlugin.pull(CopyReplacePastePlugin.java:77) at ee.translate.keeleleek.mtapplication.model.plugins.PullProxy.pullArticle(PullProxy.java:113) at ee.translate.keeleleek.mtapplication.model.plugins.PullProxy.requestPull(PullProxy.java:87) at ee.translate.keeleleek.mtapplication.controller.plugins.RequestPullCommand$1.run(RequestPullCommand.java:32) at java.lang.Thread.run(Thread.java:745)

How to fix this?

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