@@ -486,7 +486,7 @@ backtrackGraph :: TransactionGraph -> TransactionId -> TransactionIdHeadBacktrac
486backtrackGraph graph currentTid (TransactionIdHeadParentBacktrack steps) = do
486backtrackGraph graph currentTid (TransactionIdHeadParentBacktrack steps) = do
487 trans <- transactionForId currentTid graph
487 trans <- transactionForId currentTid graph
488 let parents = S.toAscList (transactionParentIds trans)
488 let parents = S.toAscList (transactionParentIds trans)
489− if length parents < 1 then
489+ if null parents then
490 Left RootTransactionTraversalError
490 Left RootTransactionTraversalError
492 parentTrans <- transactionForId (head parents) graph
492 parentTrans <- transactionForId (head parents) graph