From 822755a424d0abfa408dc34313f4aca4b816f54f Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Tue, 23 May 2017 10:04:14 -0700
Subject: [PATCH] Fix: make CCoinsViewDbCursor::Seek work for missing keys

Thanks to Suhas Daftuar for figuring this out.
---
 src/txdb.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/txdb.cpp b/src/txdb.cpp
index 42dc31760..76aab2398 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -98,7 +98,11 @@ CCoinsViewCursor *CCoinsViewDB::Cursor() const
        that restriction.  */
     i->pcursor->Seek(DB_COINS);
     // Cache key of first record
-    i->pcursor->GetKey(i->keyTmp);
+    if (i->pcursor->Valid()) {
+        i->pcursor->GetKey(i->keyTmp);
+    } else {
+        i->keyTmp.first = 0; // Make sure Valid() and GetKey() return false
+    }
     return i;
 }