diff --git a/src/app.rs b/src/app.rs
index 0b2f18f..40e1bac 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -143,17 +143,18 @@ pub struct RenderProcessHandler(cef_sys::cef_render_process_handler_t);
 /// See [cef_render_process_handler_t] for more documentation.
 pub trait CefRenderProcessHandler: Sized {
     /// See [cef_render_process_handler_t::on_web_kit_initialized] for more documentation.
-    fn on_web_kit_initialized(&self);
+    fn on_web_kit_initialized(&self) {}
 
     /// See [cef_render_process_handler_t::on_browser_created] for more documentation.
     fn on_browser_created(
         &self,
         browser: crate::CefBrowser,
         extra_info: crate::value::CefDictionaryValue,
-    );
+    ) {
+    }
 
     /// See [cef_render_process_handler_t::on_browser_destroyed] for more documentation.
-    fn on_browser_destroyed(&self, browser: crate::CefBrowser);
+    fn on_browser_destroyed(&self, browser: crate::CefBrowser) {}
 
     /// See [cef_render_process_handler_t::get_load_handler] for more documentation.
     fn get_load_handler(&self) -> Option<crate::handler::LoadHandler> {
@@ -336,6 +337,13 @@ pub trait CefRenderProcessHandler: Sized {
     }
 }
 
+impl CefRenderProcessHandler for () {
+    #[doc(hidden)]
+    fn into_raw(self) -> *mut cef_render_process_handler_t {
+        std::ptr::null_mut()
+    }
+}
+
 #[derive(Debug, Clone)]
 #[wrapper]
 /// See [cef_browser_process_handler_t] for more documentation.
@@ -459,6 +467,13 @@ pub trait CefBrowserProcessHandler: Sized {
     }
 }
 
+impl CefBrowserProcessHandler for () {
+    #[doc(hidden)]
+    fn into_raw(self) -> *mut cef_browser_process_handler_t {
+        std::ptr::null_mut()
+    }
+}
+
 #[derive(Debug, Clone)]
 #[wrapper]
 /// See [cef_resource_bundle_handler_t] for more documentation.
@@ -553,3 +568,10 @@ pub trait CefResourceBundleHandler: Sized {
         crate::rc::RcImpl::new(handler, self).cast()
     }
 }
+
+impl CefResourceBundleHandler for () {
+    #[doc(hidden)]
+    fn into_raw(self) -> *mut cef_resource_bundle_handler_t {
+        std::ptr::null_mut()
+    }
+}
diff --git a/src/handler/life_span.rs b/src/handler/life_span.rs
index 83e1a97..5723eb0 100644
--- a/src/handler/life_span.rs
+++ b/src/handler/life_span.rs
@@ -205,9 +205,12 @@ pub trait CefLifeSpanHandler: Sized {
         object.on_after_created = Some(on_after_created::<Self>);
         object.do_close = Some(do_close::<Self>);
         object.on_before_close = Some(on_before_close::<Self>);
-
         crate::rc::RcImpl::new(object, self).cast()
     }
 }
 
-impl CefLifeSpanHandler for () {}
+impl CefLifeSpanHandler for () {
+    fn into_raw(self) -> *mut cef_life_span_handler_t {
+        std::ptr::null_mut()
+    }
+}