add value to .next()

src/lib/error/error.service.ts

@@ -60,11 +60,11 @@ export class ErrorService {
     }
 
     setOnline(): void {
-        this._online$.next();
+        this._online$.next(true);
     }
 
     clear(): void {
-        this._error$.next();
+        this._error$.next(undefined);
     }
 
     private _offline() {

src/lib/filtering/filter.service.ts

@@ -34,7 +34,7 @@ export class FilterService {
     }
 
     refresh(): void {
-        this._refresh$.next();
+        this._refresh$.next(true);
     }
 
     toggleFilter(filterGroupSlug: string, key: string): void {