diff --git a/backend/src/restful/miscs.js b/backend/src/restful/miscs.js
index a50e968..aa4a19e 100644
--- a/backend/src/restful/miscs.js
+++ b/backend/src/restful/miscs.js
@@ -30,15 +30,27 @@ export default function register($app) {
                 ),
             );
         }
-        const { payload, options } = req.body;
-        const jwt = eval(`require("jsonwebtoken")`);
-        res.set('Content-Type', 'application/json;charset=utf-8').send({
-            token: jwt.sign(
+        try {
+            const { payload, options } = req.body;
+            const jwt = eval(`require("jsonwebtoken")`);
+            const token = jwt.sign(
                 payload,
                 eval('process.env.SUB_STORE_FRONTEND_BACKEND_PATH'),
                 options,
-            ),
-        });
+            );
+            res.set('Content-Type', 'application/json;charset=utf-8').send({
+                token,
+            });
+        } catch (e) {
+            return failed(
+                res,
+                new InternalServerError(
+                    'JWT_SIGN_FAILED',
+                    `Failed to sign JWT token`,
+                    `Reason: ${e.message ?? e}`,
+                ),
+            );
+        }
     });
 
     // Storage management
diff --git a/backend/src/utils/env.js b/backend/src/utils/env.js
index 2ec7e3c..87c7bee 100644
--- a/backend/src/utils/env.js
+++ b/backend/src/utils/env.js
@@ -24,6 +24,7 @@ if (isLanceX) backend = 'LanceX';
 if (isGUIforCores) backend = 'GUI.for.Cores';
 
 let meta = {};
+let feature = {};
 
 try {
     if (typeof $environment !== 'undefined') {
@@ -43,6 +44,12 @@ try {
         meta.plugin = $Plugin;
     }
     if (isNode) {
+        if (
+            eval('process.env.SUB_STORE_FRONTEND_BACKEND_PATH') &&
+            eval('process.env.SUB_STORE_FRONTEND_PATH')
+        ) {
+            feature.share = true;
+        }
         meta.node = {
             version: eval('process.version'),
             argv: eval('process.argv'),
@@ -63,5 +70,6 @@ try {
 export default {
     backend,
     version: substoreVersion,
+    feature,
     meta,
 };