autopilot: abort renewal/refresh/formation when encountering non-exis…

…tent output error

autopilot/contractor.go

@@ -1436,6 +1436,8 @@ func (c *contractor) renewContract(ctx context.Context, w Worker, ci contractInf
 		)
 		if utils.IsErr(err, wallet.ErrInsufficientBalance) && !worker.IsErrHost(err) {
 			return api.ContractMetadata{}, false, err
+		} else if isNonexistentSiacoinOutputErr(err) {
+			return api.ContractMetadata{}, false, err
 		}
 		return api.ContractMetadata{}, true, err
 	}
@@ -1515,6 +1517,8 @@ func (c *contractor) refreshContract(ctx context.Context, w Worker, ci contractI
 		c.logger.Errorw("refresh failed", zap.Error(err), "hk", hk, "fcid", fcid)
 		if utils.IsErr(err, wallet.ErrInsufficientBalance) && !worker.IsErrHost(err) {
 			return api.ContractMetadata{}, false, err
+		} else if isNonexistentSiacoinOutputErr(err) {
+			return api.ContractMetadata{}, false, err
 		}
 		return api.ContractMetadata{}, true, err
 	}
@@ -1579,6 +1583,8 @@ func (c *contractor) formContract(ctx context.Context, w Worker, host hostdb.Hos
 		c.logger.Errorw(fmt.Sprintf("contract formation failed, err: %v", err), "hk", hk)
 		if strings.Contains(err.Error(), wallet.ErrInsufficientBalance.Error()) {
 			return api.ContractMetadata{}, false, err
+		} else if isNonexistentSiacoinOutputErr(err) {
+			return api.ContractMetadata{}, false, err
 		}
 		return api.ContractMetadata{}, true, err
 	}
@@ -1690,6 +1696,11 @@ func initialContractFundingMinMax(cfg api.AutopilotConfig) (min types.Currency,
 	return
 }
 
+func isNonexistentSiacoinOutputErr(err error) bool {
+	return utils.IsErr(err, errors.New("transaction spends a nonexisting siacoin output")) ||
+		utils.IsErr(err, errors.New("spends nonexistent siacoin output"))
+}
+
 func refreshPriceTable(ctx context.Context, w Worker, host *hostdb.Host) error {
 	// return early if the host's pricetable is not expired yet
 	if time.Now().Before(host.PriceTable.Expiry) {