show errors while mounting list view children

src/platform/web/ui/general/ListView.js

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import {tag} from "./html.js";
+import {errorToDOM} from "./error.js";
 
 function insertAt(parentNode, idx, childNode) {
     const isLast = idx === parentNode.childElementCount;
@@ -106,8 +107,12 @@ export class ListView {
         for (let item of this._list) {
             const child = this._childCreator(item);
             this._childInstances.push(child);
+            try {
                 const childDomNode = child.mount(this._mountArgs);
                 fragment.appendChild(childDomNode);
+            } catch (err) {
+                fragment.appendChild(errorToDOM(err));
+            }
         }
         this._root.appendChild(fragment);
     }

src/platform/web/ui/general/error.js

@@ -18,7 +18,10 @@ import {tag} from "./html.js";
 
 export function errorToDOM(error) {
     const stack = new Error().stack;
-    const callee = stack.split("\n")[1];
+    let callee = null;
+    if (stack) {
+        callee = stack.split("\n")[1];
+    }
     return tag.div([
         tag.h2("Something went wrong…"),
         tag.h3(error.message),