diff --git a/nicegui/elements/fullscreen.js b/nicegui/elements/fullscreen.js
index 253d4a77e..10c5f6382 100644
--- a/nicegui/elements/fullscreen.js
+++ b/nicegui/elements/fullscreen.js
@@ -35,7 +35,7 @@ export default {
   
       exit() {
         // Exit fullscreen via Quasar's Fullscreen Plugin
-        return Quasar.AppFullscreen.exit()
+        Quasar.AppFullscreen.exit()
       },
   
       toggle(blockEscapeKey) {
diff --git a/nicegui/elements/fullscreen.py b/nicegui/elements/fullscreen.py
index 4b3b44549..23b13711e 100644
--- a/nicegui/elements/fullscreen.py
+++ b/nicegui/elements/fullscreen.py
@@ -22,7 +22,7 @@ def __init__(self, *, require_escape_hold: bool = False, on_state_change: Callab
         super().__init__()
         self._is_fullscreen = False
         self._require_escape_hold = require_escape_hold
-        self.on('fullscreen_change', lambda e: self._handle_fullscreen_change(e))
+        self.on('fullscreen_change', self._handle_fullscreen_change)
         self._state_change_handlers = [on_state_change] if on_state_change else []
 
     def _handle_fullscreen_change(self, event):