Better control of momonitoredStyleUrls (#141)

* Better control of momonitoredStyleUrls

* changelog update

Author: jonathanlurie

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## 2.5.1
 ### Bug Fixes
+- Better control of the status of `monitoredStyleUrls` in Map instance when error is caught (https://github.com/maptiler/maptiler-sdk-js/pull/141)
 - 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)
 

src/Map.ts

@@ -285,7 +285,7 @@ export class Map extends maplibregl.Map {
         // If the URL is present in the list of monitored style URL,
         // that means this AJAXError was about a style, and we want to fallback to
         // the default style
-        if (this.monitoredStyleUrls.has(clearnUrlStr)) {
+        if (this.monitoredStyleUrls && this.monitoredStyleUrls.has(clearnUrlStr)) {
           this.monitoredStyleUrls.delete(clearnUrlStr);
           applyFallbackStyle();
         }