diff --git a/package.json b/package.json
index f41d4f949..03ee6ff7f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "xterm",
   "description": "Full xterm terminal, in your browser",
-  "version": "3.14.2",
+  "version": "3.14.4",
   "main": "lib/public/Terminal.js",
   "types": "typings/xterm.d.ts",
   "repository": "https://github.com/xtermjs/xterm.js",
diff --git a/src/InputHandler.ts b/src/InputHandler.ts
index 94c7e96b2..7e0057dbf 100644
--- a/src/InputHandler.ts
+++ b/src/InputHandler.ts
@@ -1816,7 +1816,7 @@ export class InputHandler extends Disposable implements IInputHandler {
       this._terminal.applicationCursor = false;
       this._terminal.buffer.scrollTop = 0;
       this._terminal.buffer.scrollBottom = this._terminal.rows - 1;
-      this._terminal.curAttrData = DEFAULT_ATTR_DATA;
+      this._terminal.curAttrData = DEFAULT_ATTR_DATA.clone();
       this._terminal.buffer.x = this._terminal.buffer.y = 0; // ?
       this._terminal.charset = null;
       this._terminal.glevel = 0; // ??
diff --git a/src/core/buffer/BufferLine.ts b/src/core/buffer/BufferLine.ts
index 154cc5984..7ced096c4 100644
--- a/src/core/buffer/BufferLine.ts
+++ b/src/core/buffer/BufferLine.ts
@@ -217,7 +217,7 @@ export class AttributeData implements IAttributeData {
   }
 }
 
-export const DEFAULT_ATTR_DATA = new AttributeData();
+export const DEFAULT_ATTR_DATA = Object.freeze(new AttributeData());
 
 /**
  * CellData - represents a single Cell in the terminal buffer.