diff --git a/php/src/output/std/ConsoleMessenger.php b/php/src/output/std/ConsoleMessenger.php
index fd3d716..fe383cd 100644
--- a/php/src/output/std/ConsoleMessenger.php
+++ b/php/src/output/std/ConsoleMessenger.php
@@ -242,11 +242,13 @@ class ConsoleMessenger extends AbstractMessenger {
   }
 
   function _endTitle(?int $until=null): void {
-    $title = $this->titles[array_key_last($this->titles)];
-    $until ??= $title["max_title_level"];
-    $until ??= $this->_getTitleMark() - 1;
-    while (count($this->titles) > $until) {
-      array_pop($this->titles);
+    $title = $this->titles[array_key_last($this->titles)] ?? null;
+    if ($title !== null) {
+      $until ??= $title["max_title_level"];
+      $until ??= $this->_getTitleMark() - 1;
+      while (count($this->titles) > $until) {
+        array_pop($this->titles);
+      }
     }
   }
 
@@ -385,11 +387,13 @@ class ConsoleMessenger extends AbstractMessenger {
   }
 
   function _endAction(?int $until=null): void {
-    $action = $this->actions[array_key_last($this->actions)];
-    $until ??= $action["max_action_level"];
-    $until ??= $this->_getActionMark() - 1;
-    while (count($this->actions) > $until) {
-      array_pop($this->actions);
+    $action = $this->actions[array_key_last($this->actions)] ?? null;
+    if ($action !== null) {
+      $until ??= $action["max_action_level"];
+      $until ??= $this->_getActionMark() - 1;
+      while (count($this->actions) > $until) {
+        array_pop($this->actions);
+      }
     }
   }