🐛 Fixed crash where switched from Range to Multiple Choice

frontend/src/lib/editor/ABCDEditorPart.svelte

@@ -19,12 +19,17 @@
 
 	export let selected_question: number;
 	export let data: EditorData;
+	console.log(
+		data.questions[selected_question].answers,
+		Array.isArray(data.questions[selected_question].answers)
+	);
 	if (!Array.isArray(data.questions[selected_question].answers)) {
 		data.questions[selected_question].answers = [];
 	}
 </script>
 
 <div class="grid grid-cols-2 gap-4 w-full px-10">
+	{#if Array.isArray(data.questions[selected_question].answers)}
 		{#each data.questions[selected_question].answers as answer, index}
 			<div
 				on:contextmenu|preventDefault={() => {
@@ -36,7 +41,9 @@
 				class="p-4 rounded-lg flex justify-center w-full transition"
 				class:bg-red-500={!answer.right}
 				class:bg-green-500={answer.right}
-			class:bg-yellow-500={!reach(ABCDQuestionSchema, 'answer').isValidSync(answer.answer)}
+				class:bg-yellow-500={!reach(ABCDQuestionSchema, 'answer').isValidSync(
+					answer.answer
+				)}
 			>
 				<input
 					bind:value={answer.answer}
@@ -85,6 +92,7 @@
 				</button>
 			</div>
 		{/each}
+	{/if}
 	{#if data.questions[selected_question].answers.length < 4}
 		<button
 			class="p-4 rounded-lg bg-transparent border-gray-500 border-2 hover:bg-gray-300 transition dark:hover:bg-gray-600"

frontend/src/lib/editor/sidebar.svelte

@@ -179,14 +179,16 @@
 			{/if}
 			{#if question.type === QuizQuestionType.ABCD}
 				<div class="grid grid-cols-2 gap-2">
+					{#if Array.isArray(question.answers)}
 						{#each question.answers as answer}
 							<span
 								class="whitespace-nowrap truncate rounded-lg p-0.5 text-sm text-center border border-gray-700"
 								class:bg-green-500={answer.right}
 								class:bg-red-500={!answer.right}
-							class:bg-yellow-500={!reach(ABCDQuestionSchema, 'answer').isValidSync(
-								answer.answer
-							)}
+								class:bg-yellow-500={!reach(
+									ABCDQuestionSchema,
+									'answer'
+								).isValidSync(answer.answer)}
 								use:tippy={{
 									content: answer.answer === '' ? 'Empty...' : answer.answer
 								}}
@@ -197,6 +199,7 @@
 								{/if}</span
 							>
 						{/each}
+					{/if}
 				</div>
 			{:else if question.type === QuizQuestionType.RANGE}
 				<p class="text-center text-sm p-0.5">