Fixed session check logic. Closes #1340.

lib/session.js

@@ -49,17 +49,17 @@ export async function getSession(req) {
         country,
         device,
       });
-
-      if (!session) {
-        return null;
-      }
     } catch (e) {
-      if (!e.message.includes('Unique constraint')) {
+      if (!e.message.toLowerCase().includes('unique constraint')) {
         throw e;
       }
     }
   }
 
+  if (!session) {
+    return null;
+  }
+
   const { session_id } = session;
 
   return {