Await genericPurchase completion before page reload to prevent request cancellation.

Also adds defensive check for undefined error.response in axios interceptor to prevent "t.response undefined" errors.

website/client/src/app.vue

@@ -209,6 +209,9 @@ export default {
       return response;
     }, error => { // Set up Error interceptors
       if (error.response.status >= 400) {
+        if (!error.response) {
+          return Promise.reject(error);
+        }
         const isBanned = this.checkForBannedUser(error);
         if (isBanned === true) return null; // eslint-disable-line consistent-return
 

website/client/src/components/shops/buyModal.vue

@@ -851,7 +851,7 @@ export default {
           return;
         }
         if (this.genericPurchase) {
-          this.makeGenericPurchase(this.item, 'buyModal', this.selectedAmountToBuy);
+          await this.makeGenericPurchase(this.item, 'buyModal', this.selectedAmountToBuy);
           await this.purchased(this.item.text);
         }
       }