diff --git a/src/backup.c b/src/backup.c
index 1d58d9f2..fc863070 100644
--- a/src/backup.c
+++ b/src/backup.c
@@ -538,8 +538,8 @@ do_backup_instance(void)
 	}
 
 	/*
-	 * It`s illegal to take PTRACK backup if LSN from ptrack_control() is not equal to
-	 * stort_backup LSN of previous backup
+	 * It`s illegal to take PTRACK backup if LSN from ptrack_control() is not
+	 * equal to stop_lsn of previous backup.
 	 */
 	if (current.backup_mode == BACKUP_MODE_DIFF_PTRACK)
 	{
@@ -1283,7 +1283,9 @@ pg_ptrack_clear(void)
 		tblspcOid = atoi(PQgetvalue(res_db, i, 2));
 
 		tmp_conn = pgut_connect(dbname);
-		res = pgut_execute(tmp_conn, "SELECT pg_catalog.pg_ptrack_clear()", 0, NULL);
+		res = pgut_execute(tmp_conn, "SELECT pg_catalog.pg_ptrack_clear()",
+						   0, NULL);
+		PQclear(res);
 
 		sprintf(params[0], "%i", dbOid);
 		sprintf(params[1], "%i", tblspcOid);
@@ -1512,7 +1514,8 @@ wait_wal_lsn(XLogRecPtr lsn, bool is_start_lsn, bool wait_prev_segment)
 	if (wait_prev_segment)
 		elog(LOG, "Looking for segment: %s", wal_segment);
 	else
-		elog(LOG, "Looking for LSN: %X/%X in segment: %s", (uint32) (lsn >> 32), (uint32) lsn, wal_segment);
+		elog(LOG, "Looking for LSN: %X/%X in segment: %s",
+			 (uint32) (lsn >> 32), (uint32) lsn, wal_segment);
 
 #ifdef HAVE_LIBZ
 	snprintf(gz_wal_segment_path, sizeof(gz_wal_segment_path), "%s.gz",
@@ -2648,7 +2651,8 @@ get_last_ptrack_lsn(void)
 	uint32		lsn_lo;
 	XLogRecPtr	lsn;
 
-	res = pgut_execute(backup_conn, "select pg_catalog.pg_ptrack_control_lsn()", 0, NULL);
+	res = pgut_execute(backup_conn, "select pg_catalog.pg_ptrack_control_lsn()",
+					   0, NULL);
 
 	/* Extract timeline and LSN from results of pg_start_backup() */
 	XLogDataFromLSN(PQgetvalue(res, 0, 0), &lsn_hi, &lsn_lo);