From 95c6f53d1508057bdc927697fa5f5394cdd2c9f7 Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Wed, 4 Feb 2026 18:22:12 -0600
Subject: [PATCH] fix: handle nil sys_descr in profile matching

Fixes FunctionClauseError when sys_descr is nil during device profile
matching. Added nil check before attempting String.contains? comparison.
---
 lib/towerops/profiles/yaml_profiles.ex | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/towerops/profiles/yaml_profiles.ex b/lib/towerops/profiles/yaml_profiles.ex
index cae73b2e..15e6d981 100644
--- a/lib/towerops/profiles/yaml_profiles.ex
+++ b/lib/towerops/profiles/yaml_profiles.ex
@@ -783,6 +783,10 @@ defmodule Towerops.Profiles.YamlProfiles do
       patterns == [] and regexes == [] ->
         true
 
+      # sys_descr is nil - cannot match patterns/regexes
+      is_nil(sys_descr) ->
+        false
+
       # Has pattern constraints - must match at least one
       patterns != [] ->
         Enum.any?(patterns, fn pattern -> String.contains?(sys_descr, pattern) end)