From 9e95a2d75f93c87e39495990141e6346dc95d98e Mon Sep 17 00:00:00 2001
From: FrederikBaerentsen <frederik+gitea@baerentsen.net>
Date: Wed, 11 Dec 2024 18:48:33 +0100
Subject: [PATCH] Fixed valueerror in toGrid

---
 fred.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fred.py b/fred.py
index 3112599..d4ad47e 100644
--- a/fred.py
+++ b/fred.py
@@ -66,6 +66,8 @@ def toGrid(input, parser=None):
         FileNotFoundError: If the file cannot be found (if input is a file path).
         ValueError: If the parser function is invalid.
     """
+    if parser is not None and not callable(parser):
+        raise ValueError("The parser must be a callable function.")
 
     grid = []
     try: