src/Pure/Tools/bibtex.scala

   {
     for {
       Text.Info(r, name) <- rendering.citation(rendering.before_caret_range(caret))
       name1 <- Completion.clean_name(name)
 
-      original <- rendering.model.try_get_text(r)
+      original <- rendering.model.get_text(r)
       original1 <- Completion.clean_name(Library.perhaps_unquote(original))
 
       entries =
         (for {
           Text.Info(_, (entry, _)) <- entries_iterator(models)