FIX: StackOverflowException in PlayerInput (#1033, #1039).

Author: Rene Damm

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -29,6 +29,7 @@ however, it has to be formatted properly to pass verification tests.
 - Removing a callback from actions from the callback itself no longer throws `ArgumentOutOfRangeException` ([case 1192972](https://issuetracker.unity3d.com/issues/input-system-package-argumentoutofrangeexception-error-is-thrown-when-the-callback-is-removed-while-its-being-triggered)).
 - "Invalid user" `ArgumentException` when turning the same `PlayerInput` on and off ([case 1198889](https://issuetracker.unity3d.com/issues/input-system-package-argumentexception-invalid-user-error-is-thrown-when-the-callback-disables-game-object-with-playerinput)).
 - The list of device requirements for a control scheme in the action editor no longer displays devices with their internal layout name rather than their external display name.
+- `StackOverflowException` when `Invoke Unity Events` is selected in `PlayerInput` and it cannot find an action (#1033).
 
 ### Added
 

Packages/com.unity.inputsystem/InputSystem/Plugins/PlayerInput/PlayerInput.cs

@@ -1160,14 +1160,14 @@ private void InitializeActions()
                                 {
                                     // We have an action name. Show in message.
                                     Debug.LogError(
-                                        $"Cannot find action '{actionEvent.actionName}' with ID '{actionEvent.actionId}' in '{actions}",
+                                        $"Cannot find action '{actionEvent.actionName}' with ID '{actionEvent.actionId}' in '{m_Actions}",
                                         this);
                                 }
                                 else
                                 {
                                     // We have no action name. Best we have is ID.
                                     Debug.LogError(
-                                        $"Cannot find action with ID '{actionEvent.actionId}' in '{actions}",
+                                        $"Cannot find action with ID '{actionEvent.actionId}' in '{m_Actions}",
                                         this);
                                 }
                             }