diff --git a/src/classes/NumberMagic.ts b/src/classes/NumberMagic.ts
index fe9d2f6..520fe4e 100644
--- a/src/classes/NumberMagic.ts
+++ b/src/classes/NumberMagic.ts
@@ -11,7 +11,8 @@ const damageFormatter = new Intl.NumberFormat('en-US', {
     notation: "compact",
 });
 
-export function formatGold(number: number): string {
+export function formatGold(number: number | null): string {
+    if (number === null) return "";
     return goldFormatter.format(number);
 }
 
diff --git a/src/components/UpgradesList.vue b/src/components/UpgradesList.vue
index 36cb72a..1920014 100644
--- a/src/components/UpgradesList.vue
+++ b/src/components/UpgradesList.vue
@@ -18,10 +18,11 @@
       <small>Automatically finish quests when they are completed.</small>
       <button
           class="button metal"
+          v-if="guild.autoFinishQuestsUpgrade.nextLevelCost"
           :disabled="guild.gold < guild.autoFinishQuestsUpgrade.nextLevelCost || guild.autoFinishQuestsUpgrade.isMaxLevel()"
           @click="upgradeAutoFinishQuests()"
       >
-        <span v-if="!guild.autoFinishQuestsUpgrade.isMaxLevel()">Upgrade ({{ formatGold(guild.autoFinishQuestsUpgrade.nextLevelCost) }} gold)</span>
+        <span v-if="!guild.autoFinishQuestsUpgrade.isMaxLevel()">Upgrade ({{  formatGold(guild.autoFinishQuestsUpgrade.nextLevelCost) }} gold)</span>
         <span v-else>Max level</span>
       </button>
     </div>