Added error to callback

CHANGELOG.md

@@ -19,6 +19,7 @@ _This release is scheduled to be released on 2021-04-01._
 - Portuguese translations for "MODULE_CONFIG_CHANGED" and PRECIP.
 - Respect parameter ColoredSymbolOnly also for custom events
 - Added a new parameter to hide time portion on relative times
+- [`module.show` has now the option for a callback on error.](https://github.com/MichMich/MagicMirror/pull/2439)
 
 ### Updated
 

js/main.js

@@ -295,6 +295,9 @@ var MM = (function () {
 		// Otherwise cancel show action.
 		if (module.lockStrings.length !== 0 && options.force !== true) {
 			Log.log("Will not show " + module.name + ". LockStrings active: " + module.lockStrings.join(","));
+			if (typeof options.onError === "function") {
+				options.onError(new Error("ERR_ACTIVE_LOCK_STRINGS"));
+			}
 			return;
 		}
 

js/module.js

@@ -428,12 +428,11 @@ var Module = Class.extend({
 		callback = callback || function () {};
 		options = options || {};
 
-		var self = this;
 		MM.showModule(
 			this,
 			speed,
-			function () {
-				self.resume();
+			() => {
+				this.resume();
 				callback();
 			},
 			options