diff --git a/src/theme.js b/src/theme.js index 92bf03ef0a..9208ff2045 100644 --- a/src/theme.js +++ b/src/theme.js @@ -41,14 +41,18 @@ export class ThemeWatcher { start() { this._themeWatchRef = SettingsStore.watchSetting("theme", null, this._onChange); this._systemThemeWatchRef = SettingsStore.watchSetting("use_system_theme", null, this._onChange); - this._preferDark.addEventListener('change', this._onChange); - this._preferLight.addEventListener('change', this._onChange); + if (this._preferDark.addEventListener) { + this._preferDark.addEventListener('change', this._onChange); + this._preferLight.addEventListener('change', this._onChange); + } this._dispatcherRef = dis.register(this._onAction); } stop() { - this._preferDark.removeEventListener('change', this._onChange); - this._preferLight.removeEventListener('change', this._onChange); + if (this._preferDark.addEventListener) { + this._preferDark.removeEventListener('change', this._onChange); + this._preferLight.removeEventListener('change', this._onChange); + } SettingsStore.unwatchSetting(this._systemThemeWatchRef); SettingsStore.unwatchSetting(this._themeWatchRef); dis.unregister(this._dispatcherRef);