luci-base: luci.js: fix undefined "this" when /ubus/ is unavailable

Fixes: #2850
Fixes: 66dfe64ca ("luci-base: luci.js: cache determined RPC base url in session storage")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 4 insertions, 2 deletions

diff --git a/modules/luci-base/htdocs/luci-static/resources/luci.js b/modules/luci-base/htdocs/luci-static/resources/luci.js
index 3e40b304b6..1f883ab802 100644
--- a/modules/luci-base/htdocs/luci-static/resources/luci.js
+++ b/modules/luci-base/htdocs/luci-static/resources/luci.js
@@ -762,10 +762,12 @@
 			}
 
 			if (rpcBaseURL == null) {
+				var rpcFallbackURL = this.url('admin/ubus');
+
 				rpcBaseURL = Request.get('/ubus/').then(function(res) {
-					return (rpcBaseURL = (res.status == 400) ? '/ubus/' : this.url('admin/ubus'));
+					return (rpcBaseURL = (res.status == 400) ? '/ubus/' : rpcFallbackURL);
 				}, function() {
-					return (rpcBaseURL = L.url('admin/ubus'));
+					return (rpcBaseURL = rpcFallbackURL);
 				}).then(function(url) {
 					try {
 						window.sessionStorage.setItem('rpcBaseURL', url);