diff --git a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx
index 38e4c347..71ad4a96 100644
--- a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx
+++ b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx
@@ -23,7 +23,7 @@ const ProblemPage: NextPage<{ params: { courseId: string; programId: string } }>
   const checkPointLines = [2, 6, 8, 12];
 
   const [selectedLanguageId, setSelectedLanguageId] = useState('');
-  const [problemProgram, setProblemProgram] = useState<GeneratedProgram>();
+  const [problemProgram, setProblemProgram] = useState<GeneratedProgram>({ displayProgram: '', excuteProgram: '' });
   const [step, setStep] = useState<ProblemType>('normal');
   const [beforeCheckPointLine, setBeforeCheckPointLine] = useState(0);
   const [currentCheckPointLine, setCurrentCheckPointLine] = useState(checkPointLines[0]);
@@ -43,8 +43,6 @@ const ProblemPage: NextPage<{ params: { courseId: string; programId: string } }>
   };
 
   const ProblemComponent: React.FC = () => {
-    // problemProgramがundefinedの時の処理。どうしたらいいですか。
-    if (!problemProgram) return <></>;
     switch (step) {
       case 'normal': {
         return (
diff --git a/src/problems/problemData.ts b/src/problems/problemData.ts
index 085bc88e..08d551df 100644
--- a/src/problems/problemData.ts
+++ b/src/problems/problemData.ts
@@ -92,25 +92,17 @@ public class Straight {
   curve: {
     js: `
 const character = new Character();
-for (let i = 0; i < <3-10>; i++) {
-  character.moveForward();
-}
+for (let i = 0; i < <3-10>; i++) { character.moveForward(); }
 character.turnLeft();
-for (let i = 0; i < <3-5>; i++) {
-  character.moveForward();
-}
+for (let i = 0; i < <3-5>; i++) { character.moveForward(); }
 `.trim(),
     java: `
 public class Curve {
   public static void main(String[] args) {
     var character = new Character();
-    for (int i = 0; i < <3-10>; i++) {
-      character.moveForward();
-    }
+    for (int i = 0; i < <3-10>; i++) { character.moveForward(); }
     character.turnLeft();
-    for (int i = 0; i < <3-5>; i++) {
-      character.moveForward();
-    }
+    for (int i = 0; i < <3-5>; i++) { character.moveForward(); }
   }
 }
 `.trim(),