Resolve 500 error

app/assets/javascripts/vue_shared/vue_resource_interceptor.js.es6

@@ -6,7 +6,7 @@ Vue.http.interceptors.push((request, next) => {
   Vue.activeResources = Vue.activeResources ? Vue.activeResources + 1 : 1;
 
   next((response) => {
-    if (typeof response.data === 'string') {
+    if (typeof response.data === 'string' && response.status !== 500) {
       response.data = JSON.parse(response.data);
     }
 

app/controllers/projects/environments_controller.rb

@@ -10,7 +10,6 @@ class Projects::EnvironmentsController < Projects::ApplicationController
 
   def index
     @environments = project.environments
-      .includes(:last_deployment)
       .with_state(params[:scope] || :available)
 
     respond_to do |format|