diff --git a/lib/main.js b/lib/main.js
index 831ec186..df8ac323 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -231,13 +231,7 @@ so you can easily test run multiple events.
         S3Events: null
       }
     }
-    const list = (() => {
-      try {
-        return fs.readJsonSync(program.eventSourceFile)
-      } catch (err) {
-        throw err
-      }
-    })()
+    const list = fs.readJsonSync(program.eventSourceFile)
 
     if (Array.isArray(list)) {
       // backward-compatible