diff --git a/main.ts b/main.ts
index bd5bd9b..1cfe8fb 100644
--- a/main.ts
+++ b/main.ts
@@ -46,7 +46,7 @@ export default class VimrcPlugin extends Plugin {
 	private editorMode: 'cm5' | 'cm6' = null;
 	private initialized = false;
 
-	private lastYankBuffer = new Array<string>(0);
+	private lastYankBuffer: string[] = [""];
 	private lastSystemClipboard = "";
 	private yankToSystemClipboard: boolean = false;
 	private currentKeyChord: any = [];
@@ -92,19 +92,26 @@ export default class VimrcPlugin extends Plugin {
 			console.log('Vimrc plugin: using CodeMirror 5 mode');
 		}
 
-		this.registerDomEvent(document, 'click', () => {
-			this.captureYankBuffer();
-		});
-		this.registerDomEvent(document, 'keyup', () => {
-			this.captureYankBuffer();
-		});
-		this.registerDomEvent(document, 'focusin', () => {
-			this.captureYankBuffer();
+		await this.registerYankEvents(activeWindow)
+		this.app.workspace.on("window-open", (workspaceWindow, w) => {
+			this.registerYankEvents(w)
 		})
 
 		this.initialized = true;
 	}
 
+	registerYankEvents(win: Window) {
+		this.registerDomEvent(win.document, 'click', () => {
+			this.captureYankBuffer(win);
+		});
+		this.registerDomEvent(win.document, 'keyup', () => {
+			this.captureYankBuffer(win);
+		});
+		this.registerDomEvent(win.document, 'focusin', () => {
+			this.captureYankBuffer(win);
+		})
+	}
+
 	async onload() {
 		await this.loadSettings();
 		this.addSettingTab(new SettingsTab(this.app, this))
@@ -445,25 +452,34 @@ export default class VimrcPlugin extends Plugin {
 
 	}
 
-	captureYankBuffer() {
-		if (this.yankToSystemClipboard) {
-			let currentBuffer = this.codeMirrorVimObject.getRegisterController().getRegister('yank').keyBuffer;
-			if (currentBuffer != this.lastYankBuffer) {
-				if (this.lastYankBuffer.length > 0 && currentBuffer.length > 0 && currentBuffer[0]) {
-					navigator.clipboard.writeText(currentBuffer[0]);
-					navigator.clipboard.readText().then((value) => { this.lastSystemClipboard = value; });
-				}
-				this.lastYankBuffer = currentBuffer;
-				return;
+	async captureYankBuffer(win: Window) {
+		if (!this.yankToSystemClipboard) {
+			return
+		}
+
+		const yankRegister = this.codeMirrorVimObject.getRegisterController().getRegister('yank')
+		const currentYankBuffer = yankRegister.keyBuffer;
+
+		// yank -> clipboard
+		const buf = currentYankBuffer[0]
+		if (buf !== this.lastYankBuffer[0]) {
+			await win.navigator.clipboard.writeText(buf);
+			this.lastYankBuffer = currentYankBuffer
+			this.lastSystemClipboard = await win.navigator.clipboard.readText()
+			return
+		}
+
+		// clipboard -> yank
+		try {
+			const currentClipboardText = await win.navigator.clipboard.readText()
+			if (currentClipboardText !== this.lastSystemClipboard) {
+				yankRegister.setText(currentClipboardText);
+				this.lastYankBuffer = yankRegister.keyBuffer;
+				this.lastSystemClipboard = currentClipboardText;
 			}
-			let currentClipboard = navigator.clipboard.readText().then((value) => {
-				if (value != this.lastSystemClipboard) {
-					let yankRegister = this.codeMirrorVimObject.getRegisterController().getRegister('yank')
-					yankRegister.setText(value);
-					this.lastYankBuffer = yankRegister.keyBuffer;
-					this.lastSystemClipboard = value;
-				}
-			})
+		} catch (e) {
+			// XXX: Avoid "Uncaught (in promise) DOMException: Document is not focused."
+			// XXX: It is not good but easy workaround
 		}
 	}
 
diff --git a/package.json b/package.json
index bd87b7c..d426a67 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "@types/node": "^14.14.6",
     "codemirror": "^5.62.2",
     "keyboardevent-from-electron-accelerator": "*",
-    "obsidian": "^0.12.17",
+    "obsidian": "^0.15.3",
     "rollup": "^2.33.0",
     "tslib": "^2.0.3",
     "typescript": "^4.0.5"