diff --git a/client/pages/adminpage/backend.js b/client/pages/adminpage/backend.js
index 9c62276c..a165cc0e 100644
--- a/client/pages/adminpage/backend.js
+++ b/client/pages/adminpage/backend.js
@@ -376,7 +376,7 @@ function AuthenticationMiddleware({ authentication_available, authentication_ena
             if(attribute_mapping[selected[i].label]) continue;
             for(let j=0; j<existingValues.length; j++) {
                 if(selected[i].label === existingValues[j]) {
-                    attribute_mapping[selected[i].label] = backend_available[selected[j].type]
+                    attribute_mapping[selected[i].label] = backend_available[selected[i].type]
                     needToSave = true;
                 }
             }