diff --git a/app/app.go b/app/app.go
index ef4a0fe2..a9bb0614 100644
--- a/app/app.go
+++ b/app/app.go
@@ -61,6 +61,10 @@ type FrameEvent struct {
 type ViewEvent interface {
 	implementsViewEvent()
 	ImplementsEvent()
+	// Valid will return true when the ViewEvent does contains valid handles.
+	// If a window receives an invalid ViewEvent, it should deinitialize any
+	// state referring to handles from a previous ViewEvent.
+	Valid() bool
 }
 
 // Insets is the space taken up by
diff --git a/app/os_android.go b/app/os_android.go
index a18bd083..3255d5f9 100644
--- a/app/os_android.go
+++ b/app/os_android.go
@@ -1495,3 +1495,6 @@ func Java_org_gioui_Gio_scheduleMainFuncs(env *C.JNIEnv, cls C.jclass) {
 
 func (AndroidViewEvent) implementsViewEvent() {}
 func (AndroidViewEvent) ImplementsEvent()     {}
+func (a AndroidViewEvent) Valid() bool {
+	return a != (AndroidViewEvent{})
+}
diff --git a/app/os_ios.go b/app/os_ios.go
index 53a22eaf..2a281cb8 100644
--- a/app/os_ios.go
+++ b/app/os_ios.go
@@ -441,3 +441,6 @@ func gio_runMain() {
 
 func (UIKitViewEvent) implementsViewEvent() {}
 func (UIKitViewEvent) ImplementsEvent()     {}
+func (u UIKitViewEvent) Valid() bool {
+	return u != (UIKitViewEvent{})
+}
diff --git a/app/os_js.go b/app/os_js.go
index 79e02783..66042917 100644
--- a/app/os_js.go
+++ b/app/os_js.go
@@ -822,3 +822,6 @@ func translateKey(k string) (key.Name, bool) {
 
 func (JSViewEvent) implementsViewEvent() {}
 func (JSViewEvent) ImplementsEvent()     {}
+func (j JSViewEvent) Valid() bool {
+	return !(j.Element.IsNull() || j.Element.IsUndefined())
+}
diff --git a/app/os_macos.go b/app/os_macos.go
index a1142c86..f133ab10 100644
--- a/app/os_macos.go
+++ b/app/os_macos.go
@@ -1074,3 +1074,6 @@ func convertMods(mods C.NSUInteger) key.Modifiers {
 
 func (AppKitViewEvent) implementsViewEvent() {}
 func (AppKitViewEvent) ImplementsEvent()     {}
+func (a AppKitViewEvent) Valid() bool {
+	return a != (AppKitViewEvent{})
+}
diff --git a/app/os_unix.go b/app/os_unix.go
index 933b8ff5..28181b8f 100644
--- a/app/os_unix.go
+++ b/app/os_unix.go
@@ -21,6 +21,9 @@ type X11ViewEvent struct {
 
 func (X11ViewEvent) implementsViewEvent() {}
 func (X11ViewEvent) ImplementsEvent()     {}
+func (x X11ViewEvent) Valid() bool {
+	return x != (X11ViewEvent{})
+}
 
 type WaylandViewEvent struct {
 	// Display is the *wl_display returned by wl_display_connect.
@@ -31,6 +34,9 @@ type WaylandViewEvent struct {
 
 func (WaylandViewEvent) implementsViewEvent() {}
 func (WaylandViewEvent) ImplementsEvent()     {}
+func (w WaylandViewEvent) Valid() bool {
+	return w != (WaylandViewEvent{})
+}
 
 func osMain() {
 	select {}
diff --git a/app/os_windows.go b/app/os_windows.go
index 888391b7..7c950a5a 100644
--- a/app/os_windows.go
+++ b/app/os_windows.go
@@ -981,3 +981,6 @@ func configForDPI(dpi int) unit.Metric {
 
 func (Win32ViewEvent) implementsViewEvent() {}
 func (Win32ViewEvent) ImplementsEvent()     {}
+func (w Win32ViewEvent) Valid() bool {
+	return w != (Win32ViewEvent{})
+}
diff --git a/app/window.go b/app/window.go
index f8aee3ea..bf85099a 100644
--- a/app/window.go
+++ b/app/window.go
@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"image"
 	"image/color"
-	"reflect"
 	"runtime"
 	"sync"
 	"time"
@@ -643,7 +642,7 @@ func (w *Window) processEvent(e event.Event) bool {
 		}
 		w.coalesced.destroy = &e2
 	case ViewEvent:
-		if reflect.ValueOf(e2).IsZero() && w.gpu != nil {
+		if !e2.Valid() && w.gpu != nil {
 			w.ctx.Lock()
 			w.gpu.Release()
 			w.gpu = nil