Error on read editor.document property in preview file

[hanc2006]

If you enable the workbench.editor.enablePreview : true on vscode and you open a preview of a file the the plugin goes wrong.

ERR Cannot read property 'document' of undefined: TypeError: Cannot read property 'document' of undefined at QualityOfLife.onChangeEditorHandler (C:\Users\hanc\.vscode\extensions\HvyIndustries.crane-0.3.8\out\src\features\qualityOfLife.js:29:19) at QualityOfLife.vscode.window.onDidChangeActiveTextEditor.editor (C:\Users\hanc\.vscode\extensions\HvyIndustries.crane-0.3.8\out\src\features\qualityOfLife.js:16:68) at e.fire (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:88:729) at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:660:559 at e.fire (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:88:729) at e.$acceptDocumentsAndEditorsDelta (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:658:904) at e._doInvokeHandler (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:584:983) at e._invokeHandler (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:584:701) at e._receiveRequest (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:583:836) at e._receiveOneMessage (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:583:605) at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:582:671 at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:585:523 at c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:87:459 at e.fire (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:88:729) at Socket.<anonymous> (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:146:633) at emitOne (events.js:96:13) at Socket.emit (events.js:191:7) at readableAddChunk (_stream_readable.js:178:18) at Socket.Readable.push (_stream_readable.js:136:10) at Pipe.onread (net.js:560:20)

I changed in file qualityOfLife.js this line of the code and seems to work

onChangeEditorHandler(editor) {
        // Only process PHP files
        if (editor != null && editor.document.languageId != "php")
            return;
        this.styleTodoComments();
    }

I hope it can be useful
Thx