diff --git a/modules/leaflet_views/src/Plugin/views/row/LeafletMarker.php b/modules/leaflet_views/src/Plugin/views/row/LeafletMarker.php
index 88918ad02a10ecf6133e28eef72563eaf02bae04..bc260bac8ad35c4f241671347c8bd471255c36ee 100644
--- a/modules/leaflet_views/src/Plugin/views/row/LeafletMarker.php
+++ b/modules/leaflet_views/src/Plugin/views/row/LeafletMarker.php
@@ -346,7 +346,14 @@ class LeafletMarker extends RowPluginBase implements ContainerFactoryPluginInter
     if ($this->options['description_field'] === '#rendered_entity' && is_object($row->_entity)) {
       $entity = $row->_entity;
       $build = $this->getEntityManager()->getViewBuilder($entity->getEntityTypeId())->view($entity, $this->options['view_mode']);
-      $popup_body = $this->renderer->renderInIsolation($build);
+      // Render popup body,
+      // ensuring backward compatibility (with Drupal < 10.2).
+      if (method_exists($this->renderer, 'renderInIsolation')) {
+        $popup_body = $this->renderer->renderInIsolation($build);
+      }
+      else {
+        $popup_body = $this->renderer->renderPlain($build);
+      }
     }
     // Normal rendering via fields.
     elseif ($this->options['description_field']) {
diff --git a/modules/leaflet_views/src/Plugin/views/style/LeafletMap.php b/modules/leaflet_views/src/Plugin/views/style/LeafletMap.php
index 89ecb390286bf6dcced655446de9179dcc80d62d..71b4f408bdfae19ba0352c97a94675bd83657dfe 100644
--- a/modules/leaflet_views/src/Plugin/views/style/LeafletMap.php
+++ b/modules/leaflet_views/src/Plugin/views/style/LeafletMap.php
@@ -1264,7 +1264,14 @@ class LeafletMap extends StylePluginBase implements ContainerFactoryPluginInterf
         $render_row = [
           "markup" => $this->view->rowPlugin->render($result),
         ];
-        $popup_content = $this->renderer->renderInIsolation($render_row);
+        // Render popup content, ensuring backward compatibility
+        // (with Drupal < 10.2).
+        if (method_exists($this->renderer, 'renderInIsolation')) {
+          $popup_content = $this->renderer->renderInIsolation($render_row);
+        }
+        else {
+          $popup_content = $this->renderer->renderPlain($render_row);
+        }
         break;
 
       default: