From e8d946493846996ed9d84070d7c8abbef639bce0 Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Sat, 7 Dec 2024 00:21:58 -0300
Subject: [PATCH] fix parsing COUNT envelopes without "hll".

---
 envelopes.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/envelopes.go b/envelopes.go
index 5fcb78b..f197fb2 100644
--- a/envelopes.go
+++ b/envelopes.go
@@ -166,7 +166,12 @@ func (v *CountEnvelope) UnmarshalJSON(data []byte) error {
 	}
 	if err := json.Unmarshal([]byte(arr[2].Raw), &countResult); err == nil && countResult.Count != nil {
 		v.Count = countResult.Count
-		v.HyperLogLog, _ = hex.DecodeString(countResult.HLL)
+		if len(countResult.HLL) == 512 {
+			v.HyperLogLog, err = hex.DecodeString(countResult.HLL)
+			if err != nil {
+				return fmt.Errorf("invalid \"hll\" value in COUNT message: %w", err)
+			}
+		}
 		return nil
 	}