diff --git a/client/components/cards/cardDetails.js b/client/components/cards/cardDetails.js
index f508dab3b..5f69d4bd8 100644
--- a/client/components/cards/cardDetails.js
+++ b/client/components/cards/cardDetails.js
@@ -1012,6 +1012,9 @@ Template.editCardAssignerForm.events({
     return ret;
   }
   async setDone(cardId, options) {
+    // Capture DOM values immediately before any async operations
+    const position = this.$('input[name="position"]:checked').val();
+
     ReactiveCache.getCurrentUser().setMoveAndCopyDialogOption(this.currentBoardId, options);
     const card = this.data();
     let sortIndex = 0;
@@ -1019,7 +1022,6 @@ Template.editCardAssignerForm.events({
     if (cardId) {
       const targetCard = ReactiveCache.getCard(cardId);
       if (targetCard) {
-        const position = this.$('input[name="position"]:checked').val();
         if (position === 'above') {
           sortIndex = targetCard.sort - 0.5;
         } else {
@@ -1042,37 +1044,40 @@ Template.editCardAssignerForm.events({
     return ret;
   }
   async setDone(cardId, options) {
-    ReactiveCache.getCurrentUser().setMoveAndCopyDialogOption(this.currentBoardId, options);
-    const card = this.data();
-
-    // const textarea = $('#copy-card-title');
+    // Capture DOM values immediately before any async operations
     const textarea = this.$('#copy-card-title');
     const title = textarea.val().trim();
+    const position = this.$('input[name="position"]:checked').val();
+
+    ReactiveCache.getCurrentUser().setMoveAndCopyDialogOption(this.currentBoardId, options);
+    const card = this.data();
 
     if (title) {
       const newCardId = await Meteor.callAsync('copyCard', card._id, options.boardId, options.swimlaneId, options.listId, true, {title: title});
 
-      // Position the copied card
+      // Position the copied card (newCard may be null for cross-board copies
+      // if the client hasn't received the publication update yet)
       if (newCardId) {
         const newCard = ReactiveCache.getCard(newCardId);
-        let sortIndex = 0;
+        if (newCard) {
+          let sortIndex = 0;
 
-        if (cardId) {
-          const targetCard = ReactiveCache.getCard(cardId);
-          if (targetCard) {
-            const position = this.$('input[name="position"]:checked').val();
-            if (position === 'above') {
-              sortIndex = targetCard.sort - 0.5;
-            } else {
-              sortIndex = targetCard.sort + 0.5;
+          if (cardId) {
+            const targetCard = ReactiveCache.getCard(cardId);
+            if (targetCard) {
+              if (position === 'above') {
+                sortIndex = targetCard.sort - 0.5;
+              } else {
+                sortIndex = targetCard.sort + 0.5;
+              }
             }
+          } else {
+            // If no card selected, copy to end
+            sortIndex = newCard.getMaxSort(options.listId, options.swimlaneId) + 1;
           }
-        } else {
-          // If no card selected, copy to end
-          sortIndex = newCard.getMaxSort(options.listId, options.swimlaneId) + 1;
-        }
 
-        await newCard.move(options.boardId, options.swimlaneId, options.listId, sortIndex);
+          await newCard.move(options.boardId, options.swimlaneId, options.listId, sortIndex);
+        }
       }
 
       // In case the filter is active we need to add the newly inserted card in
@@ -1091,11 +1096,13 @@ Template.editCardAssignerForm.events({
     return ret;
   }
   async setDone(cardId, options) {
-    ReactiveCache.getCurrentUser().setMoveAndCopyDialogOption(this.currentBoardId, options);
-    const card = this.data();
-
+    // Capture DOM values immediately before any async operations
     const textarea = this.$('#copy-card-title');
     const title = textarea.val().trim();
+    const position = this.$('input[name="position"]:checked').val();
+
+    ReactiveCache.getCurrentUser().setMoveAndCopyDialogOption(this.currentBoardId, options);
+    const card = this.data();
 
     if (title) {
       const _id = Cards.insert({
@@ -1111,7 +1118,6 @@ Template.editCardAssignerForm.events({
       if (cardId) {
         const targetCard = ReactiveCache.getCard(cardId);
         if (targetCard) {
-          const position = this.$('input[name="position"]:checked').val();
           if (position === 'above') {
             sortIndex = targetCard.sort - 0.5;
           } else {
@@ -1136,11 +1142,13 @@ Template.editCardAssignerForm.events({
     return ret;
   }
   async setDone(cardId, options) {
-    ReactiveCache.getCurrentUser().setMoveAndCopyDialogOption(this.currentBoardId, options);
-    const card = this.data();
-
+    // Capture DOM values immediately before any async operations
     const textarea = this.$('#copy-card-title');
     const title = textarea.val().trim();
+    const position = this.$('input[name="position"]:checked').val();
+
+    ReactiveCache.getCurrentUser().setMoveAndCopyDialogOption(this.currentBoardId, options);
+    const card = this.data();
 
     if (title) {
       const titleList = JSON.parse(title);
@@ -1155,7 +1163,6 @@ Template.editCardAssignerForm.events({
           if (cardId) {
             const targetCard = ReactiveCache.getCard(cardId);
             if (targetCard) {
-              const position = this.$('input[name="position"]:checked').val();
               if (position === 'above') {
                 sortIndex = targetCard.sort - 0.5;
               } else {
diff --git a/client/lib/dialogWithBoardSwimlaneList.js b/client/lib/dialogWithBoardSwimlaneList.js
index 0471efd88..888601a56 100644
--- a/client/lib/dialogWithBoardSwimlaneList.js
+++ b/client/lib/dialogWithBoardSwimlaneList.js
@@ -186,7 +186,7 @@ export class DialogWithBoardSwimlaneList extends BlazeComponent {
   events() {
     return [
       {
-        'click .js-done'() {
+        async 'click .js-done'() {
           const boardSelect = this.$('.js-select-boards')[0];
           const boardId = boardSelect.options[boardSelect.selectedIndex].value;
 
@@ -201,7 +201,11 @@ export class DialogWithBoardSwimlaneList extends BlazeComponent {
             'swimlaneId' : swimlaneId,
             'listId' : listId,
           }
-          this.setDone(boardId, swimlaneId, listId, options);
+          try {
+            await this.setDone(boardId, swimlaneId, listId, options);
+          } catch (e) {
+            console.error('Error in list dialog operation:', e);
+          }
           Popup.back(2);
         },
         'change .js-select-boards'(event) {
diff --git a/client/lib/dialogWithBoardSwimlaneListCard.js b/client/lib/dialogWithBoardSwimlaneListCard.js
index 77ceb968b..10421c3c1 100644
--- a/client/lib/dialogWithBoardSwimlaneListCard.js
+++ b/client/lib/dialogWithBoardSwimlaneListCard.js
@@ -80,7 +80,7 @@ export class DialogWithBoardSwimlaneListCard extends DialogWithBoardSwimlaneList
   events() {
     return [
       {
-        'click .js-done'() {
+        async 'click .js-done'() {
           const boardSelect = this.$('.js-select-boards')[0];
           const boardId = boardSelect.options[boardSelect.selectedIndex].value;
 
@@ -99,7 +99,11 @@ export class DialogWithBoardSwimlaneListCard extends DialogWithBoardSwimlaneList
             'listId' : listId,
             'cardId': cardId,
           }
-          this.setDone(cardId, options);
+          try {
+            await this.setDone(cardId, options);
+          } catch (e) {
+            console.error('Error in card dialog operation:', e);
+          }
           Popup.back(2);
         },
         'change .js-select-boards'(event) {
diff --git a/models/cards.js b/models/cards.js
index 87be370d8..450fb0e35 100644
--- a/models/cards.js
+++ b/models/cards.js
@@ -611,6 +611,15 @@ Cards.helpers({
     const oldId = this._id;
     const oldCard = ReactiveCache.getCard(oldId);
 
+    // Work on a shallow copy to avoid mutating the source card in ReactiveCache
+    const cardData = { ...this };
+    delete cardData._id;
+
+    // Normalize customFields to ensure it's always an array
+    if (!Array.isArray(cardData.customFields)) {
+      cardData.customFields = [];
+    }
+
     // we must only copy the labels and custom fields if the target board
     // differs from the source board
     if (this.boardId !== boardId) {
@@ -633,19 +642,16 @@ Cards.helpers({
         }),
         '_id',
       );
-      // now set the new label ids
-      delete this.labelIds;
-      this.labelIds = newCardLabels;
+      cardData.labelIds = newCardLabels;
 
-      this.customFields = await this.mapCustomFieldsToBoard(newBoard._id);
+      cardData.customFields = await this.mapCustomFieldsToBoard(newBoard._id);
     }
 
-    delete this._id;
-    this.boardId = boardId;
-    this.cardNumber = ReactiveCache.getBoard(boardId).getNextCardNumber();
-    this.swimlaneId = swimlaneId;
-    this.listId = listId;
-    const _id = Cards.insert(this);
+    cardData.boardId = boardId;
+    cardData.cardNumber = ReactiveCache.getBoard(boardId).getNextCardNumber();
+    cardData.swimlaneId = swimlaneId;
+    cardData.listId = listId;
+    const _id = Cards.insert(cardData);
 
     // Copy attachments
     oldCard.attachments()
@@ -669,8 +675,6 @@ Cards.helpers({
     ReactiveCache.getCardComments({ cardId: oldId }).forEach(cmt => {
       cmt.copy(_id);
     });
-    // restore the id, otherwise new copies will fail
-    this._id = oldId;
 
     return _id;
   },
@@ -2102,6 +2106,11 @@ Cards.helpers({
       });
 
       mutatedFields.customFields = await this.mapCustomFieldsToBoard(newBoard._id);
+
+      // Ensure customFields is always an array (guards against legacy {} data)
+      if (!Array.isArray(mutatedFields.customFields)) {
+        mutatedFields.customFields = [];
+      }
     }
 
     await Cards.updateAsync(this._id, { $set: mutatedFields });