diff --git a/common/content/mow.js b/common/content/mow.js
index 6be1f2cd..e9989ef9 100644
--- a/common/content/mow.js
+++ b/common/content/mow.js
@@ -265,7 +265,12 @@ var MOW = Module("mow", {
         this.visible = true;
     },
 
-    get spaceNeeded() Math.max(0, DOM("#" + config.ids.commandContainer, document).rect.bottom - window.innerHeight),
+    get spaceNeeded() {
+        if (DOM("#dactyl-bell", document).isVisible)
+            return 0;
+        return Math.max(0, DOM("#" + config.ids.commandContainer, document).rect.bottom
+                            - window.innerHeight);
+    },
 
     /**
      * Update or remove the multi-line output widget's "MORE" prompt.
diff --git a/common/modules/dom.jsm b/common/modules/dom.jsm
index cc7384cb..b1f84cd3 100644
--- a/common/modules/dom.jsm
+++ b/common/modules/dom.jsm
@@ -376,8 +376,8 @@ var DOM = Class("DOM", {
      * @returns {boolean}
      */
     get isVisible() {
-        let style = this.style;
-        return style.visibility == "visible" && style.display != "none";
+        let style = this[0] && this.style;
+        return style && style.visibility == "visible" && style.display != "none";
     },
 
     get editor() {