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-rw-r--r--src/backend/utils/adt/xid.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/backend/utils/adt/xid.c b/src/backend/utils/adt/xid.c
index 76d29ff2a37..229e8e43e69 100644
--- a/src/backend/utils/adt/xid.c
+++ b/src/backend/utils/adt/xid.c
@@ -93,7 +93,10 @@ Datum
xid_age(PG_FUNCTION_ARGS)
{
TransactionId xid = PG_GETARG_TRANSACTIONID(0);
- TransactionId now = GetTopTransactionId();
+ TransactionId now = GetTopTransactionIdIfAny();
+
+ if (!TransactionIdIsValid(now))
+ now = ReadNewTransactionId();
/* Permanent XIDs are always infinitely old */
if (!TransactionIdIsNormal(xid))