[FIX]: Undefined var errors

src/components/Footer.vue

@@ -24,13 +24,13 @@
         >{{state.chosen.length}}</span>
       </q-tab>
       <q-tab
-        hidden="true"
+        hidden
         route="/spell"
       >
         Spell
       </q-tab>
       <q-tab
-        hidden="true"
+        hidden
         route="/about"
       >
         About

src/components/Spelllist.vue

@@ -34,9 +34,11 @@ export default {
   },
   props: [ 'spells' ],
   mounted () {
+    if (this.state.lastSpell) {
       let lastSpellPosition = this.$refs[this.state.lastSpell][0].$el.offsetTop
       let scrollingPageElement = document.getElementsByClassName('layout-view')[0]
       scrollingPageElement.scrollTop = lastSpellPosition
+    }
   },
   computed: {
     filteredSpells () {