diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 6f3f01faa2..683d6c1955 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -46,7 +46,9 @@ namespace interfaces {
 class Wallet;
 class Handler;
 
-//! Helper for findBlock to selectively return pieces of block data.
+//! Helper for findBlock to selectively return pieces of block data. If block is
+//! found, data will be returned by setting specified output variables. If block
+//! is not found, output variables will keep their previous values.
 class FoundBlock
 {
 public:
@@ -71,6 +73,7 @@ public:
     bool* m_in_active_chain = nullptr;
     const FoundBlock* m_next_block = nullptr;
     CBlock* m_data = nullptr;
+    mutable bool found = false;
 };
 
 //! Interface giving clients (wallet processes, maybe other analysis tools in
diff --git a/src/node/interfaces.cpp b/src/node/interfaces.cpp
index 12f5727cb2..34ed833f25 100644
--- a/src/node/interfaces.cpp
+++ b/src/node/interfaces.cpp
@@ -483,6 +483,7 @@ bool FillBlock(const CBlockIndex* index, const FoundBlock& block, UniqueLock<Rec
         REVERSE_LOCK(lock);
         if (!ReadBlockFromDisk(*block.m_data, index, Params().GetConsensus())) block.m_data->SetNull();
     }
+    block.found = true;
     return true;
 }