diff --git a/Userland/Applications/Browser/InspectorWidget.cpp b/Userland/Applications/Browser/InspectorWidget.cpp
index 0779097600..5142f171d8 100644
--- a/Userland/Applications/Browser/InspectorWidget.cpp
+++ b/Userland/Applications/Browser/InspectorWidget.cpp
@@ -61,6 +61,13 @@ void InspectorWidget::set_selection(GUI::ModelIndex const index)
         return;
     m_selection = move(selection);
 
+    // Note: Non-visible nodes don't have style data and such, and will hit assertions if inspection is attempted.
+    if (!json->get("visible").to_bool(true)) {
+        clear_style_json();
+        clear_node_box_model();
+        return;
+    }
+
     auto maybe_inspected_node_properties = m_web_view->inspect_dom_node(m_selection.dom_node_id, m_selection.pseudo_element);
     if (maybe_inspected_node_properties.has_value()) {
         auto inspected_node_properties = maybe_inspected_node_properties.value();
@@ -203,6 +210,14 @@ void InspectorWidget::update_node_box_model(Optional<String> node_box_sizing_jso
     m_element_size_view->set_box_model(m_node_box_sizing);
 }
 
+void InspectorWidget::clear_node_box_model()
+{
+    m_node_box_sizing = Web::Layout::BoxModelMetrics {};
+    m_element_size_view->set_node_content_width(0);
+    m_element_size_view->set_node_content_height(0);
+    m_element_size_view->set_box_model(m_node_box_sizing);
+}
+
 void InspectorWidget::clear_style_json()
 {
     m_selection_specified_values_json.clear();
diff --git a/Userland/Applications/Browser/InspectorWidget.h b/Userland/Applications/Browser/InspectorWidget.h
index 4ea84703b7..bff3d1ed30 100644
--- a/Userland/Applications/Browser/InspectorWidget.h
+++ b/Userland/Applications/Browser/InspectorWidget.h
@@ -54,6 +54,7 @@ private:
     void load_style_json(String specified_values_json, String computed_values_json, String custom_properties_json);
     void update_node_box_model(Optional<String> node_box_sizing_json);
     void clear_style_json();
+    void clear_node_box_model();
 
     RefPtr<WebView::OutOfProcessWebView> m_web_view;