fix(docs): guard before redirecting

src/app/@core/guard/theme.guard.ts

@@ -15,12 +15,16 @@ export class ThemeGuard implements CanActivate {
   ): Observable<boolean> | Promise<boolean> | boolean {
     return this.currentThemeService.currentTheme$.pipe(
         map(theme => {
-          const currentThemeExpiration = JSON.parse(theme).expires_in;
-          const currentDate = new Date().getTime();
-          if (!theme || currentDate > currentThemeExpiration) {
+          if (!theme || this.hasExpired(theme)) {
             this.router.navigate(['themes']);
           }
           return true;
         }));
   }
+
+  private hasExpired(theme): boolean {
+    const currentThemeExpiration = JSON.parse(theme).expires_in;
+    const currentDate = new Date().getTime();
+    return currentDate > currentThemeExpiration;
+  }
 }

src/app/@core/utils/theme.service.ts

@@ -21,7 +21,7 @@ export class CurrentThemeService implements OnDestroy {
   }
 
   getCurrentTheme(): string {
-    return JSON.parse(localStorage.theme).themeName;
+    return localStorage.theme ? JSON.parse(localStorage.theme).themeName : 'default';
   }
 
   calculateExpiration(iat: number): number {

src/app/@theme/components/header/header.component.ts

@@ -62,15 +62,14 @@ export class HeaderComponent implements OnInit, OnDestroy {
     private analytics: AnalyticsService,
     private currentThemeService: CurrentThemeService,
   ) {
-  }
-
-  ngOnInit() {
     this.materialTheme$ = new Observable(subscriber => {
       const themeName: string = this.currentThemeService.getCurrentTheme();
 
       subscriber.next(themeName.startsWith('material'));
     });
+  }
 
+  ngOnInit() {
     this.currentTheme = this.themeService.currentTheme;
 
     this.userService.getUsers()
@@ -104,6 +103,10 @@ export class HeaderComponent implements OnInit, OnDestroy {
   changeTheme(themeName: string) {
     this.currentThemeService.setCurrentTheme(themeName);
     this.themeService.changeTheme(themeName);
+
+    this.materialTheme$ = new Observable(subscriber => {
+      subscriber.next(this.currentThemeService.getCurrentTheme().startsWith('material'));
+    });
   }
 
   toggleSidebar(): boolean {

src/app/app-routing.module.ts

@@ -53,8 +53,8 @@ export const routes: Routes = [
       },
     ],
   },
-  { path: '', redirectTo: 'themes', pathMatch: 'full' },
-  { path: '**', redirectTo: 'themes' },
+  { path: '', redirectTo: 'pages/dashboard', pathMatch: 'full' },
+  { path: '**', redirectTo: 'pages/dashboard' },
 ];
 
 const config: ExtraOptions = {

src/app/app.component.ts

@@ -11,6 +11,7 @@ import { NbThemeService } from '@nebular/theme';
 import { AnalyticsService } from './@core/utils/analytics.service';
 import { AbService } from './@core/utils/ab.service';
 import { SeoService } from './@core/utils/seo.service';
+import { CurrentThemeService } from './@core/utils/theme.service';
 
 @Component({
   selector: 'ngx-app',
@@ -24,7 +25,8 @@ export class AppComponent implements OnInit {
               private seoService: SeoService,
               private activatedRoute: ActivatedRoute,
               private abService: AbService,
-              private themeService: NbThemeService) {
+              private themeService: NbThemeService,
+              private currentThemeService: CurrentThemeService) {
 
     this.themeService.onThemeChange()
       .subscribe((theme: any) => {
@@ -35,6 +37,8 @@ export class AppComponent implements OnInit {
       .subscribe((params: any) => {
         if (params.theme && this.themes.includes(params.theme)) {
           this.themeService.changeTheme(params.theme);
+        } else {
+          this.themeService.changeTheme(this.currentThemeService.getCurrentTheme());
         }
       });
   }