diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index 2d1bb0b..ef485d0 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -524,8 +524,7 @@ export class AppComponent implements OnInit, OnDestroy {
         restrictedData ? "" : "/myCommunities", false, [], [], {}));
     }
     this.showMenu = true;
-    // if (typeof document !== "undefined" && this.bottom) {
-    if (typeof document !== "undefined" && properties && this.isClient && this.showMenu) {
+    if (typeof IntersectionObserver !== "undefined") {
       setTimeout(() => {
         this.createObservers();
       });
diff --git a/src/app/communities/communities.component.ts b/src/app/communities/communities.component.ts
index ad7b2ed..6ecac7a 100644
--- a/src/app/communities/communities.component.ts
+++ b/src/app/communities/communities.component.ts
@@ -92,7 +92,8 @@ export class CommunitiesComponent implements OnInit, OnDestroy, AfterViewInit {
     this.subscriptions.forEach(subscription => {
       if (subscription instanceof Subscriber) {
         subscription.unsubscribe();
-      } else if (subscription instanceof IntersectionObserver || subscription instanceof MutationObserver) {
+      } else if ((typeof MutationObserver != 'undefined' && subscription instanceof MutationObserver) ||
+          (typeof IntersectionObserver != 'undefined' && subscription instanceof IntersectionObserver)) {
         subscription.disconnect();
       }
     });
@@ -100,7 +101,7 @@ export class CommunitiesComponent implements OnInit, OnDestroy, AfterViewInit {
   }
   
   ngAfterViewInit() {
-    if(typeof window !== "undefined") {
+    if(typeof IntersectionObserver !== "undefined" && typeof MutationObserver !== "undefined") {
       this.createObservers();
     }
   }
diff --git a/src/app/learn-how/learn-how.component.ts b/src/app/learn-how/learn-how.component.ts
index 906f7fb..89a2e1f 100644
--- a/src/app/learn-how/learn-how.component.ts
+++ b/src/app/learn-how/learn-how.component.ts
@@ -279,12 +279,14 @@ export class LearnHowComponent implements OnInit {
     this.subscriptions.forEach(subscription => {
       if (subscription instanceof Subscriber) {
         subscription.unsubscribe();
+      } else if(typeof IntersectionObserver !== 'undefined' && subscription instanceof IntersectionObserver) {
+        subscription.disconnect();
       }
     });
   }
 
 	ngAfterViewInit() {
-    if (typeof window !== "undefined") {
+    if (typeof IntersectionObserver !== "undefined") {
       this.createObservers();
     }
   }
diff --git a/src/app/openaireLibrary b/src/app/openaireLibrary
index 2f98910..4700cc8 160000
--- a/src/app/openaireLibrary
+++ b/src/app/openaireLibrary
@@ -1 +1 @@
-Subproject commit 2f989107123ae674aba4907b113e4498a8f87786
+Subproject commit 4700cc82c866ed86158234f706fc52360bc34637