diff --git a/src/app/app.component.html b/src/app/app.component.html
index 47a8357..9ec3736 100644
--- a/src/app/app.component.html
+++ b/src/app/app.component.html
@@ -1,4 +1,4 @@
-<div [style.background]="postsService.theme.background_color" style="width: 100%; height: 100%;">
+<div [style.background]="postsService.theme ? postsService.theme.background_color : null" style="width: 100%; height: 100%;">
     <mat-toolbar color="primary" class="top">
         <div class="flex-row" width="100%" height="100%">
             <div class="flex-column" style="text-align: left; margin-top: 1px;">