diff --git a/static/css/style.css b/static/css/style.css
index 3584cb8..dfa7dc6 100644
--- a/static/css/style.css
+++ b/static/css/style.css
@@ -106,6 +106,11 @@ body {
     border-top-width: 1px;
 }
 
+.notesDiv {
+    height: calc(100% - 50px);
+    overflow-y: scroll;
+}
+
 .notesBar button {
     width: calc(100% - 7px - 7px - 3.5px);
     height: 35px;
diff --git a/static/js/main.js b/static/js/main.js
index 3155ed2..95e8f9f 100644
--- a/static/js/main.js
+++ b/static/js/main.js
@@ -132,8 +132,10 @@ function displayPrompt(message, callback) {
     errorInput.value = ""
 
     closeErrorButton.addEventListener("click", (event) => {
-        callback(errorInput.value)
-        callback = undefined
+        if (callback) {
+            callback(errorInput.value)
+            callback = undefined
+        }
     });
     errorInput.addEventListener("keyup", (event) => {
         if (event.key == "Enter") {