diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 1201ed12d43..6b54505b6a1 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -889,8 +889,6 @@ export default class BattleScene extends SceneBase {
 
 		let battleConfig: FixedBattleConfig = null;
 
-		throw new Error('JLIN not implemented.');
-
 		this.resetSeed(newWaveIndex);
 
 		const playerField = this.getPlayerField();
diff --git a/src/main.ts b/src/main.ts
index 973f57fda37..4b181f58174 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -19,6 +19,7 @@ window.onerror = function (message, source, lineno, colno, error) {
 	return true;
 };
 
+// Catch global promise rejections and display them in an alert so users can report the issue.
 window.addEventListener('unhandledrejection', (event) => {	
 	let errorString = `Received unhandled promise rejection. Open browser console and click OK to see details.\nReason: ${event.reason}`;
 	alert(errorString);