diff --git a/externalProcess.cs b/externalProcess.cs
index e366534..f37048f 100644
--- a/externalProcess.cs
+++ b/externalProcess.cs
@@ -5,6 +5,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Text;
 using System.Text.RegularExpressions;
+using Newtonsoft.Json;
 
 namespace silverworker_discord
 {
@@ -59,7 +60,13 @@ namespace silverworker_discord
                     errorFilename = $"{dumpDir}/error{i}.err";
                 }
                 File.WriteAllText(outputFilename, outputData.ToString());
-                File.WriteAllText(errorFilename, errorFilename.ToString());
+                using(var sw =new StreamWriter(new FileStream(errorFilename, FileMode.Append, FileAccess.Write)))
+                {
+                    sw.WriteLine("== my own error ==");
+                    sw.WriteLine(JsonConvert.SerializeObject(e));
+                    sw.WriteLine("== error log ==");
+                    sw.WriteLine(errorData.ToString());
+                }
                 return false;
             }
             return true;