Fix crashes on *-once elements when called at bad timings

core/static/bundled/core/components/include-index.ts

@@ -84,7 +84,11 @@ const refreshElement = <
       return;
     }
 
-    element.refresh();
+    // This might be called at some bad timing
+    // This prevents crashes of the observer
+    if (element.refresh) {
+      element.refresh();
+    }
   }
 };
 
@@ -130,7 +134,7 @@ startObserver(observer);
 export class LinkOnce extends elementOnce("link") {
   getElementQuerySelector(): string {
     // We get href from node.attributes instead of node.href to avoid getting the domain part
-    return `link[href='${this.node.attributes.getNamedItem("href").nodeValue}']`;
+    return `link[href='${this.node.attributes.getNamedItem("href")?.nodeValue}']`;
   }
 }
 
@@ -142,6 +146,6 @@ export class LinkOnce extends elementOnce("link") {
 export class ScriptOnce extends inheritHtmlElement("script") {
   getElementQuerySelector(): string {
     // We get href from node.attributes instead of node.src to avoid getting the domain part
-    return `script[src='${this.node.attributes.getNamedItem("src").nodeValue}']`;
+    return `script[src='${this.node.attributes.getNamedItem("src")?.nodeValue}']`;
   }
 }