From 155c32992169b4275a0cbe08a1b0b1a2939cb47e Mon Sep 17 00:00:00 2001
From: Fabian Joswig <fabian.joswig@ed.ac.uk>
Date: Mon, 6 Jun 2022 15:47:41 +0100
Subject: [PATCH] fix: bug in error propagation for correlated fits fixed.

---
 pyerrors/fits.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pyerrors/fits.py b/pyerrors/fits.py
index 6c7ea066..489c2f8b 100644
--- a/pyerrors/fits.py
+++ b/pyerrors/fits.py
@@ -559,7 +559,10 @@ def _standard_fit(x, y, func, silent=False, **kwargs):
 
     fitp = fit_result.x
     try:
-        hess = jacobian(jacobian(chisqfunc))(fitp)
+        if kwargs.get('correlated_fit') is True:
+            hess = jacobian(jacobian(chisqfunc_corr))(fitp)
+        else:
+            hess = jacobian(jacobian(chisqfunc))(fitp)
     except TypeError:
         raise Exception("It is required to use autograd.numpy instead of numpy within fit functions, see the documentation for details.") from None