diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index e529821b7c292..746dae73cb618 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -680,6 +680,9 @@ void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> ran
             copyFrom = &mapWallet[hash];
         }
     }
+
+    assert(copyFrom);
+
     // Now copy data from copyFrom to rest:
     for (TxSpends::iterator it = range.first; it != range.second; ++it)
     {