diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c2896a44..b63c0a131 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,17 @@
+# Upcoming Wekan release
+
+This release fixes the following bugs:
+
+* [Fix errors caused by checklist items activities](https://github.com/wekan/wekan/pull/1200).
+
+Thanks to GitHub users GhassenRjab and nztqa for contributions.
+
 # v0.34 2017-08-30 Wekan release
 
 This release adds the following new features:
 
-* [Import Trello and Wekan board times of creation of activities](https://github.com/wekan/wekan/pull/1187).
+* [Import Trello and Wekan board times of creation of activities](https://github.com/wekan/wekan/pull/1187);
+* Newest Wekan is available at Sandstorm App Market.
 
 Known issues:
 
diff --git a/models/checklists.js b/models/checklists.js
index ab4fe61d8..2521412f0 100644
--- a/models/checklists.js
+++ b/models/checklists.js
@@ -164,21 +164,32 @@ if (Meteor.isServer) {
   // The future is now
   Checklists.after.update((userId, doc, fieldNames, modifier) => {
     if (fieldNames.includes('items')) {
-      Activities.insert({
-        userId,
-        activityType: 'addChecklistItem',
-        cardId: doc.cardId,
-        boardId: Cards.findOne(doc.cardId).boardId,
-        checklistId: doc._id,
-        checklistItemId: modifier.$addToSet.items._id,
-      });
+      if (modifier.$addToSet) {
+        Activities.insert({
+          userId,
+          activityType: 'addChecklistItem',
+          cardId: doc.cardId,
+          boardId: Cards.findOne(doc.cardId).boardId,
+          checklistId: doc._id,
+          checklistItemId: modifier.$addToSet.items._id,
+        });
+      } else if (modifier.$pull) {
+        const activity = Activities.findOne({
+          checklistItemId: modifier.$pull.items._id,
+        });
+        if (activity) {
+          Activities.remove(activity._id);
+        }
+      }
     }
   });
 
   Checklists.before.remove((userId, doc) => {
-    const activity = Activities.findOne({ checklistId: doc._id });
-    if (activity) {
-      Activities.remove(activity._id);
+    const activities = Activities.find({ checklistId: doc._id });
+    if (activities) {
+      activities.forEach((activity) => {
+        Activities.remove(activity._id);
+      });
     }
   });
 }