LibWeb: Show error page if we can't handle a frame's main resource

If we can't figure out how to make a Document for the main resource
in a Frame, just show an error page.

1 files changed, 6 insertions, 1 deletions

diff --git a/Libraries/LibWeb/Loader/FrameLoader.cpp b/Libraries/LibWeb/Loader/FrameLoader.cpp
index f855229698..afd595bfaf 100644
--- a/Libraries/LibWeb/Loader/FrameLoader.cpp
+++ b/Libraries/LibWeb/Loader/FrameLoader.cpp
@@ -221,7 +221,12 @@ void FrameLoader::resource_did_load()
 
     dbg() << "I believe this content has MIME type '" << resource()->mime_type() << "', encoding '" << resource()->encoding() << "'";
     auto document = create_document_from_mime_type(resource()->encoded_data(), url, resource()->mime_type(), resource()->encoding());
-    ASSERT(document);
+
+    if (!document) {
+        load_error_page(url, "Failed to parse content.");
+        return;
+    }
+
     frame().set_document(document);
 
     if (!url.fragment().is_empty())