diff --git a/lib/features/email/presentation/controller/single_email_controller.dart b/lib/features/email/presentation/controller/single_email_controller.dart
index 572404de3d..6ca5259b36 100644
--- a/lib/features/email/presentation/controller/single_email_controller.dart
+++ b/lib/features/email/presentation/controller/single_email_controller.dart
@@ -1724,9 +1724,10 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
     if (_acceptCalendarEventInteractor == null
       || _displayingEventBlobId == null
       || mailboxDashBoardController.accountId.value == null
+      || mailboxDashBoardController.sessionCurrent == null
       || mailboxDashBoardController.sessionCurrent
-        ?.validateCalendarEventCapability(mailboxDashBoardController.accountId.value!)
-        .isAvailable == true
+        !.validateCalendarEventCapability(mailboxDashBoardController.accountId.value!)
+        .isAvailable == false
     ) {
       consumeState(Stream.value(Left(CalendarEventAcceptFailure())));
     } else {
@@ -1743,8 +1744,9 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
     if (_rejectCalendarEventInteractor == null
       || _displayingEventBlobId == null
       || mailboxDashBoardController.accountId.value == null
+      || mailboxDashBoardController.sessionCurrent == null
       || mailboxDashBoardController.sessionCurrent
-        ?.validateCalendarEventCapability(mailboxDashBoardController.accountId.value!)
+        !.validateCalendarEventCapability(mailboxDashBoardController.accountId.value!)
         .isAvailable == true
     ) {
       consumeState(Stream.value(Left(CalendarEventRejectFailure())));
@@ -1762,9 +1764,10 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
     if (_maybeCalendarEventInteractor == null
       || _displayingEventBlobId == null
       || mailboxDashBoardController.accountId.value == null
+      || mailboxDashBoardController.sessionCurrent == null
       || mailboxDashBoardController.sessionCurrent
-        ?.validateCalendarEventCapability(mailboxDashBoardController.accountId.value!)
-        .isAvailable == true
+        !.validateCalendarEventCapability(mailboxDashBoardController.accountId.value!)
+        .isAvailable == false
     ) {
       consumeState(Stream.value(Left(CalendarEventMaybeFailure())));
     } else {