diff --git a/website/common/script/content/loginIncentives.js b/website/common/script/content/loginIncentives.js
index 88cd142ed6..4a53cd22d4 100644
--- a/website/common/script/content/loginIncentives.js
+++ b/website/common/script/content/loginIncentives.js
@@ -79,7 +79,10 @@ export default function getLoginIncentives (api) {
       reward: [api.quests.moon1],
       assignReward: function assignReward (user) {
         if (!user.items.quests.moon1) user.items.quests.moon1 = 0;
-        user.items.quests.moon1 += 1;
+        user.items.quests = {
+          ...user.items.quests,
+          moon1: user.items.quests.moon1 + 1,
+        };
         if (user.markModified) user.markModified('items.quests');
       },
     },
@@ -133,7 +136,10 @@ export default function getLoginIncentives (api) {
       reward: [api.quests.moon2],
       assignReward: function assignReward (user) {
         if (!user.items.quests.moon2) user.items.quests.moon2 = 0;
-        user.items.quests.moon2 += 1;
+        user.items.quests = {
+          ...user.items.quests,
+          moon2: user.items.quests.moon2 + 1,
+        };
         if (user.markModified) user.markModified('items.quests');
       },
     },
@@ -193,7 +199,10 @@ export default function getLoginIncentives (api) {
       reward: [api.quests.moon3],
       assignReward: function assignReward (user) {
         if (!user.items.quests.moon3) user.items.quests.moon3 = 0;
-        user.items.quests.moon3 += 1;
+        user.items.quests = {
+          ...user.items.quests,
+          moon3: user.items.quests.moon3 + 1,
+        };
         if (user.markModified) user.markModified('items.quests');
       },
     },
diff --git a/website/common/script/fns/updateStats.js b/website/common/script/fns/updateStats.js
index 7eb672eb24..79b4f660c7 100644
--- a/website/common/script/fns/updateStats.js
+++ b/website/common/script/fns/updateStats.js
@@ -95,7 +95,10 @@ export default function updateStats (user, stats, req = {}, analytics) {
       if (user.markModified) user.markModified('flags.levelDrops');
 
       if (!user.items.quests[k]) user.items.quests[k] = 0;
-      user.items.quests[k] += 1;
+      user.items.quests = {
+        ...user.items.quests,
+        [k]: user.items.quests[k] + 1,
+      };
       if (user.markModified) user.markModified('items.quests');
 
       if (analytics) {
diff --git a/website/common/script/ops/buy/buyQuestGem.js b/website/common/script/ops/buy/buyQuestGem.js
index 3f099d2a3a..91f60ad6df 100644
--- a/website/common/script/ops/buy/buyQuestGem.js
+++ b/website/common/script/ops/buy/buyQuestGem.js
@@ -47,7 +47,10 @@ export class BuyQuestWithGemOperation extends AbstractGemItemOperation { // esli
       !user.items.quests[item.key]
       || user.items.quests[item.key] < 0
     ) user.items.quests[item.key] = 0;
-    user.items.quests[item.key] += this.quantity;
+    user.items.quests = {
+      ...user.items.quests,
+      [item.key]: user.items.quests[item.key] + this.quantity,
+    };
     if (user.markModified) user.markModified('items.quests');
 
     this.subtractCurrency(user, item, this.quantity);
diff --git a/website/common/script/ops/buy/buyQuestGold.js b/website/common/script/ops/buy/buyQuestGold.js
index ead059829c..a4f16d4bfd 100644
--- a/website/common/script/ops/buy/buyQuestGold.js
+++ b/website/common/script/ops/buy/buyQuestGold.js
@@ -67,7 +67,10 @@ export class BuyQuestWithGoldOperation extends AbstractGoldItemOperation { // es
       !user.items.quests[item.key]
       || user.items.quests[item.key] < 0
     ) user.items.quests[item.key] = 0;
-    user.items.quests[item.key] += this.quantity;
+    user.items.quests = {
+      ...user.items.quests,
+      [item.key]: user.items.quests[item.key] + this.quantity,
+    };
     if (user.markModified) user.markModified('items.quests');
 
     this.subtractCurrency(user, item, this.quantity);