From 42b80c18adf6186404256304223d438d20e5770a Mon Sep 17 00:00:00 2001
From: Randall Winkhart <idgr@tutanota.com>
Date: Sat, 18 Oct 2025 16:53:53 -0400
Subject: [PATCH] Add error handling for bad UPS IDs

---
 nut.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/nut.go b/nut.go
index 6de6715..8bb8f89 100644
--- a/nut.go
+++ b/nut.go
@@ -78,7 +78,11 @@ func (c *Client) GetVar(upsID, varName string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	value := strings.Trim(strings.Join(strings.Split(l, " ")[3:], " "), "\"")
+	lSplit := strings.Split(l, " ")
+	if len(lSplit) < 4 {
+		return "", fmt.Errorf("invalid response to GET VAR; check your UPS ID")
+	}
+	value := strings.Trim(strings.Join(lSplit[3:], " "), "\"")
 	return value, nil
 }