From 43b3352c87d8e44c8d968cd06b14c58efbaf59b3 Mon Sep 17 00:00:00 2001
From: mossid <torecursedivine@gmail.com>
Date: Tue, 9 Oct 2018 05:06:40 +0900
Subject: [PATCH] fix Close()

---
 store/prefixstore.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/store/prefixstore.go b/store/prefixstore.go
index a29459e4e8..04d268057d 100644
--- a/store/prefixstore.go
+++ b/store/prefixstore.go
@@ -152,13 +152,15 @@ func (iter prefixIterator) Next() {
 	}
 	iter.iter.Next()
 	if !iter.iter.Valid() || !bytes.HasPrefix(iter.iter.Key(), iter.prefix) {
-		iter.iter.Close()
 		iter.valid = false
 	}
 }
 
 // Implements Iterator
 func (iter prefixIterator) Key() (key []byte) {
+	if !iter.valid {
+		panic("prefixIterator invalid, cannot call Key()")
+	}
 	key = iter.iter.Key()
 	key = stripPrefix(key, iter.prefix)
 	return
@@ -166,6 +168,9 @@ func (iter prefixIterator) Key() (key []byte) {
 
 // Implements Iterator
 func (iter prefixIterator) Value() []byte {
+	if !iter.valid() {
+		panic("prefixIterator invalid, cannot call Value()")
+	}
 	return iter.iter.Value()
 }