Prevent state to be toggled whilst a request is pending

src/components/views/dialogs/InviteDialog.tsx

@@ -886,6 +886,7 @@ export default class InviteDialog extends React.PureComponent<IInviteDialogProps
     };
 
     _toggleMember = (member: Member) => {
+        if (!this.state.busy) {
             let filterText = this.state.filterText;
             const targets = this.state.targets.map(t => t); // cheap clone for mutation
             const idx = targets.indexOf(member);
@@ -900,6 +901,7 @@ export default class InviteDialog extends React.PureComponent<IInviteDialogProps
             if (this._editorRef && this._editorRef.current) {
                 this._editorRef.current.focus();
             }
+        }
     };
 
     _removeMember = (member: Member) => {