Roxygenize does not work with ... is.call (call) is not TRUE

Every time I try to roxygenizepackage, I get this error:

Error: is.call(call) is not TRUE

Results a traceback():

11: stop(sprintf(ngettext(length(r), "%s is not TRUE", "%s are not all TRUE"), 
        ch), call. = FALSE, domain = NA)
10: stopifnot(is.call(call))
9: standardise_call(call, env)
8: object_from_call(call, env, preref)
7: (function (call, ref, comment_ref) 
   {
       preref <- parse.preref(as.character(comment_ref))
       if (is.null(preref)) 
           return()
       preref$object <- object_from_call(call, env, preref)
       preref$srcref <- list(filename = file, lloc = as.vector(ref))
       add_defaults(preref)
   })(dots[[1L]][[1L]], dots[[2L]][[1L]], dots[[3L]][[1L]])
6: mapply(FUN = f, ..., SIMPLIFY = FALSE)
5: Map(extract, parsed, refs, comment_refs)
4: FUN(c("/home/path/to/package/file1.r", 
   "/home/path/to/package/file2.r", 
   .... # list of files truncated 
   "/home/path/to/package/doc.file.r")[[25L]], 
       ...)
3: lapply(r_files(base_path), parse_file, env = env)
2: parse_package(base_path, load_code)
1: roxygenize("~/Current/r/path/to/package/")

Has anyone experienced this problem before? I'm not even sure how to debug it.