diff --git a/src/domain/session/room/CallViewModel.ts b/src/domain/session/room/CallViewModel.ts
index 0ba774a2..484543b7 100644
--- a/src/domain/session/room/CallViewModel.ts
+++ b/src/domain/session/room/CallViewModel.ts
@@ -55,7 +55,7 @@ export class CallViewModel extends ErrorReportViewModel<SegmentType, Options<Seg
                     emitChange,
                     mediaRepository: this.getOption("room").mediaRepository
                 })),
-                (vm: CallMemberViewModel) => vm.onUpdate(),
+                (param, vm) => vm?.onUpdate(),
             ) as BaseObservableMap<string, IStreamViewModel>; 
         this.memberViewModels = otherMemberViewModels
             .join(ownMemberViewModelMap)
diff --git a/src/matrix/calls/group/GroupCall.ts b/src/matrix/calls/group/GroupCall.ts
index efb321b2..0b8c7db5 100644
--- a/src/matrix/calls/group/GroupCall.ts
+++ b/src/matrix/calls/group/GroupCall.ts
@@ -126,7 +126,7 @@ export class GroupCall extends EventEmitter<{change: never}> {
                     member.dispose();
                     this._members.remove(memberKey);
                 } else {
-                    this._members.update(memberKey, member);
+                    this._members.update(memberKey);
                 }
             },
             encryptDeviceMessage: (userId: string, deviceId: string, message: SignallingMessage<MGroupCallBase>, log) => {