This will be fixed in the next commit.
---
 test/T560-lib-error.sh | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/test/T560-lib-error.sh b/test/T560-lib-error.sh
index 5a5f66b8..b5600851 100755
--- a/test/T560-lib-error.sh
+++ b/test/T560-lib-error.sh
@@ -358,4 +358,22 @@ cat <<EOF > EXPECTED
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+backup_database
+test_begin_subtest "Handle getting thread-id from closed database"
+test_subtest_known_broken
+cat c_head2 - c_tail <<'EOF' | test_C ${MAIL_DIR}
+    {
+        const char *id2;
+        id2=notmuch_message_get_thread_id (message);
+        printf("%s\n%d\n", id, id2==NULL);
+    }
+EOF
+cat <<EOF > EXPECTED
+== stdout ==
+1258471718-6781-1-git-send-email-dottedmag@dottedmag.net
+1
+== stderr ==
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 test_done
-- 
2.27.0

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