Check queue == NULL if we can't connect to server.

src/mir_window.c

@@ -427,6 +427,8 @@ void _glfwInitEventQueue(EventQueue* queue)
 
 void _glfwDeleteEventQueue(EventQueue* queue)
 {
+    if (queue)
+    {
         EventNode* node, *node_next;
         node = queue->head.tqh_first;
 
@@ -439,6 +441,9 @@ void _glfwDeleteEventQueue(EventQueue* queue)
 
             node = node_next;
         }
+    }
+
+    free(queue);
 }
 
 //////////////////////////////////////////////////////////////////////////