diff --git a/app/assets/javascripts/exercise.ts b/app/assets/javascripts/exercise.ts
index ed304c5f49..d02b41e643 100644
--- a/app/assets/javascripts/exercise.ts
+++ b/app/assets/javascripts/exercise.ts
@@ -318,6 +318,10 @@ async function initExerciseShow(exerciseId: number, programmingLanguage: string,
     }
 
     function enableSubmitButton(): void {
+        if (!loggedIn) {
+            return;
+        }
+
         const btn = document.getElementById("editor-process-btn") as HTMLButtonElement;
         btn.disabled = false;
         btn.classList.remove("busy", "mdi-timer-sand-empty", "mdi-spin");
@@ -325,6 +329,10 @@ async function initExerciseShow(exerciseId: number, programmingLanguage: string,
     }
 
     function disableSubmitButton(): void {
+        if (!loggedIn) {
+            return;
+        }
+
         const btn = document.getElementById("editor-process-btn") as HTMLButtonElement;
         btn.disabled = true;
         btn.classList.remove("mdi-send");