{"record":{"id":"f9226479db828c1c","repo":"Unity-Technologies/UnityCsReference","slug":"no-parent-view","errorCode":null,"errorMessage":"No parent view","messagePattern":"No parent view","errorType":"exception","errorClass":"LayoutException","httpStatus":null,"severity":"error","filePath":"Editor/Mono/GUI/WindowLayout.cs","lineNumber":1007,"sourceCode":"                    newDockArea.RemoveTab(oldWindow);\n                    UnityObject.DestroyImmediate(oldWindow);\n\n                    foreach (UnityObject o in newWindows)\n                    {\n                        EditorWindow curWin = o as EditorWindow;\n                        if (curWin != null)\n                            curWin.MakeParentsSettingsMatchMe();\n                    }\n\n                    parent.Initialize(parent.window);\n\n                    //If parent window had to be resized, call this to make sure new size gets propagated\n                    parent.position = parent.position;\n                    oldRoot.Reflow();\n                }\n                else\n                {\n                    throw new LayoutException(\"No parent view\");\n                }\n\n                // Kill the maximizedMainView\n                UnityObject.DestroyImmediate(maximizedHostView);\n\n                win.Focus();\n\n                var gv = win as GameView;\n                if (gv != null)\n                    gv.m_Parent.EnableVSync(gv.vSyncEnabled);\n            }\n            catch (Exception ex)\n            {\n                Debug.Log(\"Maximization failed: \" + ex);\n                ResetAllLayouts();\n            }\n        }\n","sourceCodeStart":989,"sourceCodeEnd":1025,"githubUrl":"https://github.com/Unity-Technologies/UnityCsReference/blob/225b0fbdb57cc17d094e8056b71f8314aba56f73/Editor/Mono/GUI/WindowLayout.cs#L989-L1025","documentation":"During the 'maximize main view' / un-maximize flow, the code expects to find a parent view to reparent the docked pane into; if no parent view exists it throws LayoutException. This guards against an inconsistent host-view hierarchy that would otherwise leave the window in a broken docking state.","triggerScenarios":"Calling the maximize/un-maximize routine when the current host view has no parent (e.g. it is already the root container); a layout state where the GameView/SceneView was orphaned by a previous failed dock operation; programmatic window manipulation that detached the pane from its container.","commonSituations":"Editor extension that moves windows between containers; a docking bug that orphaned a pane; recovering from a previously aborted layout load.","solutions":["Ensure the window still has a valid parent container before triggering maximize/un-maximize.","Reset the layout to default to restore a consistent view hierarchy.","Avoid programmatically reparenting host views; use the documented docking API.","If scripting maximize, check that maximizedHostView has a parent before invoking the operation."],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// confirm the host view has a parent before maximize/un-maximize\nif (hostView?.parent == null) return;","typeGuard":null,"tryCatchPattern":"try { /* maximize routine */ }\ncatch (LayoutException ex) when (ex.Message == \"No parent view\")\n{ /* reset to default layout */ }","preventionTips":["Do not programmatically detach host views from their containers.","Reset the layout when docking state becomes inconsistent.","Use the documented docking API rather than direct reparenting."],"tags":["window-layout","docking","invalid-state","editor","validation"],"backgroundTag":null,"analyzedSha":"225b0fbdb57cc17d094e8056b71f8314aba56f73","analyzedAt":"2026-08-13T19:07:19.849Z","schemaVersion":2},"datasetVersion":"2026-08-13T19:17:28.613Z"}