diff --git a/Editor/ObfusPasses/SymbolObfus/RenameRecordMap.cs b/Editor/ObfusPasses/SymbolObfus/RenameRecordMap.cs
index a1e12ae..de5b13e 100644
--- a/Editor/ObfusPasses/SymbolObfus/RenameRecordMap.cs
+++ b/Editor/ObfusPasses/SymbolObfus/RenameRecordMap.cs
@@ -238,7 +238,7 @@ namespace Obfuz.ObfusPasses.SymbolObfus
 
         private void LoadXmlMappingFile(string mappingFile)
         {
-            if (!File.Exists(mappingFile))
+            if (string.IsNullOrEmpty(mappingFile) || !File.Exists(mappingFile))
             {
                 return;
             }
@@ -389,6 +389,10 @@ namespace Obfuz.ObfusPasses.SymbolObfus
 
         public void WriteXmlMappingFile()
         {
+            if (string.IsNullOrEmpty(_mappingFile))
+            {
+                return;
+            }
             var doc = new XmlDocument();
             var root = doc.CreateElement("mapping");
             doc.AppendChild(root);
diff --git a/Editor/ObfusPasses/SymbolObfus/SymbolRename.cs b/Editor/ObfusPasses/SymbolObfus/SymbolRename.cs
index e39ea76..b6bdcbc 100644
--- a/Editor/ObfusPasses/SymbolObfus/SymbolRename.cs
+++ b/Editor/ObfusPasses/SymbolObfus/SymbolRename.cs
@@ -59,7 +59,7 @@ namespace Obfuz.ObfusPasses.SymbolObfus
             _useConsistentNamespaceObfuscation = settings.useConsistentNamespaceObfuscation;
             _mappingXmlPath = settings.mappingFile;
             _obfuscationRuleFiles = settings.ruleFiles.ToList();
-            _renameRecordMap = new RenameRecordMap(settings.mappingFile);
+            _renameRecordMap = new RenameRecordMap(settings.debug ? null : settings.mappingFile);
             _virtualMethodGroupCalculator = new VirtualMethodGroupCalculator();
             _nameMaker = settings.debug ? NameMakerFactory.CreateDebugNameMaker() :  NameMakerFactory.CreateNameMakerBaseASCIICharSet(settings.obfuscatedNamePrefix);
         }