Search estaba dentro de main y debia estar dentro de Fragment

src/components/Search.jsx

@@ -155,10 +155,10 @@ export class Search extends React.Component {
     };
 
     render = () => (
-        <main>
+        <Fragment>
             <h1>Búsqueda</h1>
             <SearchBar query={this.state.query} onQueryChanged={this.handleQueryChange} history={this.props.history}/>
             <SearchTabs query={this.state.query} onTabChanged={this.handleTabChange} onPageChange={this.handlePageChange} selected={this.state.who} page={this.state.page}/>
-        </main>
+        </Fragment>
     );
 }