diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 8764084e21..c4d956b9c1 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -8783,6 +8783,8 @@ do_pg_abort_backup(int code, Datum arg)
 	{
 		XLogCtl->Insert.forcePageWrites = false;
 	}
+
+	sessionBackupState = SESSION_BACKUP_NONE;
 	WALInsertLockRelease();
 
 	if (emit_warning)
diff --git a/src/backend/replication/basebackup.c b/src/backend/replication/basebackup.c
index 5244823ff8..22255b6ce6 100644
--- a/src/backend/replication/basebackup.c
+++ b/src/backend/replication/basebackup.c
@@ -233,6 +233,12 @@ perform_base_backup(basebackup_options *opt, bbsink *sink)
 	StringInfo	labelfile;
 	StringInfo	tblspc_map_file;
 	backup_manifest_info manifest;
+	SessionBackupState status = get_backup_status();
+
+	if (status == SESSION_BACKUP_RUNNING)
+		ereport(ERROR,
+				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+				 errmsg("a backup is already in progress in this session")));
 
 	/* Initial backup state, insofar as we know it now. */
 	state.tablespaces = NIL;