From ba6e993adcc31401872eb8d4095c80dd08871e0c Mon Sep 17 00:00:00 2001
From: JeremyWesthead <67918949+JeremyWesthead@users.noreply.github.com>
Date: Wed, 24 Jul 2024 17:31:39 +0100
Subject: [PATCH] fix: check for None on filter before `in` check

---
 gumpy/variantfile.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gumpy/variantfile.py b/gumpy/variantfile.py
index dc8650e..4b777c8 100644
--- a/gumpy/variantfile.py
+++ b/gumpy/variantfile.py
@@ -566,7 +566,7 @@ def __find_calls(self):
                 not record.is_filter_pass
             ):
                 # We only want to allow these through if the filter fail contains MIN_FRS
-                if "MIN_FRS" in record.filter:
+                if record.filter is not None and "MIN_FRS" in record.filter:
                     # Allow MIN_FRS
                     variant = record.ref
                     variant_type = "ref"