diff --git a/src/core/features/block/components/side-blocks/side-blocks.ts b/src/core/features/block/components/side-blocks/side-blocks.ts
index 9df174d08..736ad9422 100644
--- a/src/core/features/block/components/side-blocks/side-blocks.ts
+++ b/src/core/features/block/components/side-blocks/side-blocks.ts
@@ -21,6 +21,7 @@ import { CoreBlockComponent } from '../block/block';
 import { CoreUtils } from '@services/utils/utils';
 import { IonRefresher } from '@ionic/angular';
 import { CoreCoursesDashboard } from '@features/courses/services/dashboard';
+import { CoreTextUtils } from '@services/utils/text';
 
 /**
  * Component that displays the list of side blocks.
@@ -95,11 +96,7 @@ export class CoreBlockSideBlocksComponent implements OnInit {
         }
 
         this.blocks = this.blocks.filter(block =>
-            block.name !== 'html' ||
-            (
-                block.name === 'html' &&
-                !!block.contents?.content.trim().replace(/(\r\n|\n|\r)/, '').length
-            ));
+            block.name !== 'html' || (block.contents && !CoreTextUtils.htmlIsBlank(block.contents.content)));
     }
 
     /**
diff --git a/src/core/services/utils/text.ts b/src/core/services/utils/text.ts
index 55c2b5fb5..f58e0bf99 100644
--- a/src/core/services/utils/text.ts
+++ b/src/core/services/utils/text.ts
@@ -622,9 +622,12 @@ export class CoreTextUtilsProvider {
             return true;
         }
 
-        this.template.innerHTML = content;
+        this.template.innerHTML = content.trim().replace(/(\r\n|\n|\r)/g, '');
+        const tags = this.template.content.querySelectorAll(
+            'img, audio, video, object, iframe, canvas, svg, input, select, textarea, frame, embed',
+        );
 
-        return this.template.content.textContent == '' && this.template.content.querySelector('img, object, hr') === null;
+        return this.template.content.textContent === '' && tags.length === 0;
     }
 
     /**