diff --git a/app/client/components/CustomCalendarView.ts b/app/client/components/CustomCalendarView.ts
index 7777edcd..f666ff30 100644
--- a/app/client/components/CustomCalendarView.ts
+++ b/app/client/components/CustomCalendarView.ts
@@ -2,21 +2,36 @@ import {AccessLevel} from "app/common/CustomWidget";
 import {ViewSectionRec} from "app/client/models/entities/ViewSectionRec";
 import {CustomView} from "app/client/components/CustomView";
 import {GristDoc} from "app/client/components/GristDoc";
+import {reportError} from 'app/client/models/errors';
 
 //Abstract class for more future inheritances
 abstract class CustomAttachedView extends CustomView {
   public override create(gristDoc: GristDoc, viewSectionModel: ViewSectionRec) {
     super.create(gristDoc, viewSectionModel);
-    void viewSectionModel.customDef.access.setAndSave(AccessLevel.full);
+    if (viewSectionModel.customDef.access.peek() !== AccessLevel.full) {
+      void viewSectionModel.customDef.access.setAndSave(AccessLevel.full).catch((err)=>{
+        if (err?.code === "ACL_DENY") {
+          // do nothing, we might be in a readonly mode.
+          return;
+        }
+        reportError(err);
+      });
+    }
 
     const widgetsApi = this.gristDoc.app.topAppModel.api;
     widgetsApi.getWidgets().then(async result=>{
       const widget = result.find(w=>w.name == this.getWidgetName());
-      if(widget) {
+      if (widget && this.customDef.url.peek() !== widget.url) {
         await this.customDef.url.setAndSave(widget.url);
       }
-    }).catch(()=>{
-      //do nothing
+    }).catch((err)=>{
+      if (err?.code !== "ACL_DENY") {
+        // TODO: revisit it later. getWidgets() is async call, and non of the code
+        // above is checking if we are still alive.
+        console.error(err);
+      } else {
+        // do nothing, we might be in a readonly mode.
+      }
     });
   }