diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index a528241131..646b209b2c 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -384,12 +384,14 @@ WaitForOlderSnapshots(TransactionId limitXmin, bool progress)
 
 		if (VirtualTransactionIdIsValid(old_snapshots[i]))
 		{
+			/* If requested, publish who we're going to wait for. */
 			if (progress)
 			{
 				PGPROC	   *holder = BackendIdGetProc(old_snapshots[i].backendId);
 
-				pgstat_progress_update_param(PROGRESS_WAITFOR_CURRENT_PID,
-											 holder->pid);
+				if (holder)
+					pgstat_progress_update_param(PROGRESS_WAITFOR_CURRENT_PID,
+												 holder->pid);
 			}
 			VirtualXactLock(old_snapshots[i], true);
 		}
diff --git a/src/backend/storage/lmgr/lmgr.c b/src/backend/storage/lmgr/lmgr.c
index f838b0f758..889841f4cc 100644
--- a/src/backend/storage/lmgr/lmgr.c
+++ b/src/backend/storage/lmgr/lmgr.c
@@ -900,16 +900,14 @@ WaitForLockersMultiple(List *locktags, LOCKMODE lockmode, bool progress)
 
 		while (VirtualTransactionIdIsValid(*lockholders))
 		{
-			/*
-			 * If requested, publish who we're going to wait for.  This is not
-			 * 100% accurate if they're already gone, but we don't care.
-			 */
+			/* If requested, publish who we're going to wait for. */
 			if (progress)
 			{
 				PGPROC	   *holder = BackendIdGetProc(lockholders->backendId);
 
-				pgstat_progress_update_param(PROGRESS_WAITFOR_CURRENT_PID,
-											 holder->pid);
+				if (holder)
+					pgstat_progress_update_param(PROGRESS_WAITFOR_CURRENT_PID,
+												 holder->pid);
 			}
 			VirtualXactLock(*lockholders, true);
 			lockholders++;