diff --git a/src/common/InputHandler.ts b/src/common/InputHandler.ts
index 670cd68c..9a32ea69 100644
--- a/src/common/InputHandler.ts
+++ b/src/common/InputHandler.ts
@@ -1152,10 +1152,12 @@ export class InputHandler extends Disposable implements IInputHandler {
    * @param y row index
    */
   private _resetBufferLine(y: number, respectProtect: boolean = false): void {
-    const line = this._activeBuffer.lines.get(this._activeBuffer.ybase + y)!;
-    line.fill(this._activeBuffer.getNullCell(this._eraseAttrData()), respectProtect);
-    this._bufferService.buffer.clearMarkers(this._activeBuffer.ybase + y);
-    line.isWrapped = false;
+    const line = this._activeBuffer.lines.get(this._activeBuffer.ybase + y);
+    if (line) {
+      line.fill(this._activeBuffer.getNullCell(this._eraseAttrData()), respectProtect);
+      this._bufferService.buffer.clearMarkers(this._activeBuffer.ybase + y);
+      line.isWrapped = false;
+    }
   }
 
   /**
diff --git a/src/common/services/OptionsService.ts b/src/common/services/OptionsService.ts
index a8650e76..94714f33 100644
--- a/src/common/services/OptionsService.ts
+++ b/src/common/services/OptionsService.ts
@@ -178,12 +178,16 @@ export class OptionsService extends Disposable implements IOptionsService {
         if (value <= 0) {
           throw new Error(`${key} cannot be less than or equal to 0, value: ${value}`);
         }
+        break;
       case 'rows':
       case 'cols':
         if (!value && value !== 0) {
           throw new Error(`${key} must be numeric, value: ${value}`);
         }
         break;
+      case 'windowsPty':
+        value = value ?? {};
+        break;
     }
     return value;
   }