new NavigationEventTarget on new page

src/browser/navigation/Navigation.zig

@@ -47,6 +47,12 @@ index: usize = 0,
 entries: std.ArrayListUnmanaged(*NavigationHistoryEntry) = .empty,
 next_entry_id: usize = 0,
 
+pub fn resetForNewPage(self: *Navigation) void {
+    // libdom will automatically clean this up when a new page is made.
+    // We must create a new target whenever we create a new page.
+    self.proto = NavigationEventTarget{};
+}
+
 pub fn get_canGoBack(self: *const Navigation) bool {
     return self.index > 0;
 }

src/browser/session.zig

@@ -104,6 +104,9 @@ pub const Session = struct {
         // We need to init this early as JS event handlers may be registered through Runtime.evaluate before the first html doc is loaded
         parser.init();
 
+        // creates a new event target for Navigation
+        self.navigation.resetForNewPage();
+
         const page_arena = &self.browser.page_arena;
         _ = page_arena.reset(.{ .retain_with_limit = 1 * 1024 * 1024 });
         _ = self.browser.state_pool.reset(.{ .retain_with_limit = 4 * 1024 });