add extra check on style obj (#142)

* add extra check on style obj

* changelog update

Author: jonathanlurie

CHANGELOG.md

@@ -1,7 +1,8 @@
 # MapTiler SDK Changelog
 
 ## 2.5.1
-### Bug fixes
+### Bug Fixes
+- Added extra integrity checks on style object when updating language (https://github.com/maptiler/maptiler-sdk-js/pull/142)
 - The Geolocate control no longer throwing error when window is lost (issue on Firefox only) (https://github.com/maptiler/maptiler-sdk-js/pull/140)
 
 ## 2.5.0

src/Map.ts

@@ -928,7 +928,7 @@ export class Map extends maplibregl.Map {
   }
 
   private getStyleLanguage(): LanguageInfo | null {
-    if (!this.style.stylesheet.metadata) return null;
+    if (!this.style || !this.style.stylesheet || !this.style.stylesheet.metadata) return null;
     if (typeof this.style.stylesheet.metadata !== "object") return null;
 
     if (