diff --git a/lib/logs.js b/lib/logs.js
index 3e30109..cc9b2f5 100644
--- a/lib/logs.js
+++ b/lib/logs.js
@@ -164,8 +164,8 @@ Logs.prototype.logServerProcess = function (serverProcess, prefix, suffix) {
   })
 
   serverProcess.on('error', function (err) {
-    if (logStream) {
-      logStream.write(err)
+    if (logStream && err) {
+      logStream.write(err.toString())
     }
   })
 }