*** a/src/backend/replication/logical/launcher.c
--- b/src/backend/replication/logical/launcher.c
***************
*** 781,786 **** ApplyLauncherWakeup(void)
--- 781,788 ----
  void
  ApplyLauncherMain(Datum main_arg)
  {
+ 	TimestampTz		last_start_time = 0;
+ 
  	ereport(DEBUG1,
  			(errmsg("logical replication launcher started")));
  
***************
*** 812,818 **** ApplyLauncherMain(Datum main_arg)
  		MemoryContext	subctx;
  		MemoryContext	oldctx;
  		TimestampTz		now;
- 		TimestampTz		last_start_time = 0;
  		long			wait_time = DEFAULT_NAPTIME_PER_CYCLE;
  
  		now = GetCurrentTimestamp();
--- 814,819 ----