diff --git a/app/src/main/java/org/mozilla/fenix/HomeActivity.kt b/app/src/main/java/org/mozilla/fenix/HomeActivity.kt
index f216fd405a..cf5df4ed18 100644
--- a/app/src/main/java/org/mozilla/fenix/HomeActivity.kt
+++ b/app/src/main/java/org/mozilla/fenix/HomeActivity.kt
@@ -88,6 +88,7 @@ open class HomeActivity : AppCompatActivity() {
     }
 
     override fun onDestroy() {
+        themeManager.onThemeChange = null
         sessionObserver?.let { components.core.sessionManager.unregister(it) }
         super.onDestroy()
     }