diff --git a/lib/editor.ts b/lib/editor.ts
index 17d3f68..64f3931 100644
--- a/lib/editor.ts
+++ b/lib/editor.ts
@@ -82,10 +82,14 @@ export class CursorEditor extends CustomEditor {
     }
   }
 
-  /** Write a raw escape sequence to the terminal (via pi-tui's TUI.terminal.write). */
+  /** Write a raw escape sequence to the terminal (via pi-tui's TUI.terminal.write).
+   *  Must call write as a METHOD (t.terminal.write(seq)) so `this` is the Terminal
+   *  instance — detaching the fn reference loses `this` (Terminal.write reads
+   *  this.writeLogPath) and throws. */
   private writeTerm(seq: string): void {
     const t = this.tui as any;
-    (t?.terminal?.write ?? t?.write)?.(seq);
+    if (t?.terminal?.write) t.terminal.write(seq);
+    else if (t?.write) t.write(seq);
   }
 
   /** Restore the terminal's default cursor (call on session_shutdown). */
diff --git a/package.json b/package.json
index 980386a..c5738e2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@getpipher/cursor",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Focus-aware, customizable editor cursor for the pi coding agent (truecolor + Ghostty/tmux deep; tmux + cmux + herdr; static fallback).",
   "keywords": [
     "pi-package",
diff --git a/tests/editor.test.ts b/tests/editor.test.ts
index ebfcbaa..cb71c80 100644
--- a/tests/editor.test.ts
+++ b/tests/editor.test.ts
@@ -89,13 +89,21 @@ test("setFocus(true) twice is a no-op (no redundant renders)", () => {
 function mockTui() {
   const writes: string[] = [];
   const hw: boolean[] = [];
+  // NOTE: `write` is a regular function (not an arrow) so it depends on `this`
+  // being the terminal object — mirroring the real pi-tui Terminal.write which
+  // reads this.writeLogPath. This catches the function-detachment bug where
+  // `(t.terminal.write)(seq)` loses `this` → throws.
+  const terminal = {
+    writes,
+    write(s: string) { this.writes.push(s); },
+  };
   return {
     writes,
     hw,
     tui: {
       setShowHardwareCursor(v: boolean) { hw.push(v); },
       requestRender() {},
-      terminal: { write(s: string) { writes.push(s); } },
+      terminal,
     },
   };
 }