From 03750ccc004f0b39ff012da3c96c57661e8890eb Mon Sep 17 00:00:00 2001
From: Andrew Johnson <andrew.johnson@arjohnsonau.com>
Date: Thu, 11 Jan 2024 19:34:29 +0200
Subject: [PATCH] ANother null check

---
 R/fit.R | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/R/fit.R b/R/fit.R
index 3580c602..f1bf4786 100644
--- a/R/fit.R
+++ b/R/fit.R
@@ -341,8 +341,9 @@ init_model_methods <- function(seed = 0, verbose = FALSE, hessian = FALSE, force
   }
   require_suggested_package("Rcpp")
   require_suggested_package("RcppEigen")
-  if (length(private$model_methods_env_$hpp_code_) == 0 &&
-        !file.exists(private$model_methods_env_$obj_file_)) {
+  if (length(private$model_methods_env_$hpp_code_) == 0 && (
+        is.null(private$model_methods_env_$obj_file_) ||
+        !file.exists(private$model_methods_env_$obj_file_))) {
     stop("Model methods cannot be used with a pre-compiled Stan executable, ",
           "the model must be compiled again", call. = FALSE)
   }