diff --git a/storage/modules/balance_storage.go b/storage/modules/balance_storage.go
index 00778913..49b9a349 100644
--- a/storage/modules/balance_storage.go
+++ b/storage/modules/balance_storage.go
@@ -1317,7 +1317,9 @@ func (b *BalanceStorage) removeHistoricalBalances(
 		}
 	}
 
-	if orphan {
+	// We don't update the pruned value when index is less
+	// than 0 because big.Int conversion doesn't support signed values.
+	if orphan || index < 0 {
 		return nil
 	}