diff --git a/src/components/Controls/index.js b/src/components/Controls/index.js
index 01b6e08..48ce966 100644
--- a/src/components/Controls/index.js
+++ b/src/components/Controls/index.js
@@ -20,14 +20,18 @@ const Controls = ({onRefresh, onReset, onUndo, onRedo, editorMode}) => {
           <Reset />
           <span>Reset</span>
         </div>
-        <div className={styles.undo} onClick={onUndo}>
-          <Undo />
-          <span>Undo</span>
-        </div>
-        <div className={styles.redo} onClick={onRedo}>
-          <Redo />
-          <span>Redo</span>
-        </div>
+        {!editorMode && (
+          <div className={styles.undo} onClick={onUndo}>
+            <Undo />
+            <span>Undo</span>
+          </div>
+        )}
+        {!editorMode && (
+          <div className={styles.redo} onClick={onRedo}>
+            <Redo />
+            <span>Redo</span>
+          </div>
+        )}
         {!editorMode && (
           <div className={styles.add} onClick={() => setShowAddScreen(true)}>
             <Plus />
diff --git a/src/components/Grid/components/N.js b/src/components/Grid/components/N.js
index cb48447..9eb4cf8 100644
--- a/src/components/Grid/components/N.js
+++ b/src/components/Grid/components/N.js
@@ -8,7 +8,7 @@ const N = ({className, value, setNum, editorMode, ...props}) => {
       <input
         readOnly={!editorMode}
         onChange={(e) => setNum(parseInt(e.target.value))}
-        value={value >= 0 && !isNaN(value) ? value : undefined}
+        value={value >= 0 && !isNaN(value) ? value : ""}
       />
     </span>
   );