Always check first if a feature is enabled before doing anything else to increase compatibility with other modules

src/features/locked_door_alert.js

@@ -26,13 +26,13 @@ export function onRenderChatMessage(message, html, data) {
 
 // Creates a chat message stating that a player tried to open a locked door
 export function onDoorLeftClick() {
-	const state = this.wall.data.ds
-	const states = CONST.WALL_DOOR_STATES
-
 	// Check if this feature is enabled
 	if (!game.settings.get(settingsKey, "lockedDoorAlert"))
 		return false
 
+	const state = this.wall.data.ds
+	const states = CONST.WALL_DOOR_STATES
+
 	// Only create messages when the door is locked.
 	if (state != states.LOCKED)
 		return false

src/features/synchronized_doors.js

@@ -3,7 +3,7 @@ import * as Util from "../util.js"
 
 // Inject settings for synchronized doors
 export function onRederWallConfig(wallConfig, html, data) {
-	if (data.isDoor && game.settings.get(settingsKey, "synchronizedDoors")) {
+	if (game.settings.get(settingsKey, "synchronizedDoors") && data.isDoor) {
 		// Inject settings
 		const synchronizedSettings = `
 			<p class="notes">${game.i18n.localize("smart-doors.ui.synchronizedDoors.description")}</p>

src/features/toggle_secret_door.js

@@ -2,7 +2,7 @@ import {settingsKey} from "../settings.js"
 
 // Toggles between normal and secret doors
 export function onDoorLeftClick(event) {
-	if (event.data.originalEvent.ctrlKey && game.user.isGM && game.settings.get(settingsKey, "toggleSecretDoors")) {
+	if (game.settings.get(settingsKey, "toggleSecretDoors") && event.data.originalEvent.ctrlKey && game.user.isGM) {
 		const types = CONST.WALL_DOOR_TYPES
 		const newtype = this.wall.data.door === types.DOOR ? types.SECRET : types.DOOR
 		this.wall.update({door: newtype})