fix: Force closing the connection before trying to reconnect

static/js/index/index_map.js

@@ -225,6 +225,7 @@ function connect_source_map() {
     };
     source_map.onerror = function(){
         console.log('error: '+source_map.readyState);
+        source_map.close()
         setTimeout(function() { connect_source_map(); }, 5000);
     };
 }