diff --git a/src/index.js b/src/index.js
index a52f6b3..e119626 100644
--- a/src/index.js
+++ b/src/index.js
@@ -524,7 +524,7 @@ if (cluster.isPrimary || cluster.isPrimary === undefined) {
     serverconsole.locerrmessage(
       err.stack ? generateErrorStack(err) : String(err),
     );
-    process.exit(err.errno);
+    process.exit(err.errno !== undefined ? err.errno : 1);
   }
 
   process.on("uncaughtException", crashHandlerMaster);
@@ -601,7 +601,7 @@ if (cluster.isPrimary || cluster.isPrimary === undefined) {
     serverconsole.locerrmessage(
       err.stack ? generateErrorStack(err) : String(err),
     );
-    process.exit(err.errno);
+    process.exit(err.errno !== undefined ? err.errno : 1);
   }
 
   process.on("uncaughtException", crashHandler);