diff --git a/lib/action.rb b/lib/action.rb
index 5ba60e1..5eb0ad4 100644
--- a/lib/action.rb
+++ b/lib/action.rb
@@ -17,7 +17,7 @@
     if config.event_payload['action'] == 'opened' || config.event_payload['action'] == 'synchronize'
       puts 'Pull request is opened or synchronized'
       puts '============================================='
-      PrDeployCheck.base_check(config, 'issues', config.event_payload[config.event_name]['head']['sha'])
+      PrDeployCheck.base_check(config, 'issues', config.event_payload['pull_request']['head']['sha'])
     else
       puts 'Pull request is labeled'
       puts '============================================='