diff --git a/Assets/_ModularAvatar/EditModeTests/TestBase.cs b/Assets/_ModularAvatar/EditModeTests/TestBase.cs
index 250b8308..dc94a770 100644
--- a/Assets/_ModularAvatar/EditModeTests/TestBase.cs
+++ b/Assets/_ModularAvatar/EditModeTests/TestBase.cs
@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using nadena.dev.modular_avatar.core.editor;
+using nadena.dev.modular_avatar.editor.ErrorReporting;
 using NUnit.Framework;
 using UnityEditor;
 using UnityEditor.Animations;
@@ -17,6 +18,7 @@ namespace modular_avatar_tests
         [SetUp]
         public virtual void Setup()
         {
+            BuildReport.Clear();
             objects = new List<GameObject>();
         }
 
diff --git a/Packages/nadena.dev.modular-avatar/Editor/ErrorReporting/ErrorReportUI.cs b/Packages/nadena.dev.modular-avatar/Editor/ErrorReporting/ErrorReportUI.cs
index 29c8c144..f5150776 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/ErrorReporting/ErrorReportUI.cs
+++ b/Packages/nadena.dev.modular-avatar/Editor/ErrorReporting/ErrorReportUI.cs
@@ -23,6 +23,8 @@ namespace nadena.dev.modular_avatar.editor.ErrorReporting
 
         public static void MaybeOpenErrorReportUI()
         {
+            if (Application.isBatchMode) return; // headless unit tests
+
             if (BuildReport.CurrentReport.Avatars.Any(av => av.logs.Count > 0))
             {
                 OpenErrorReportUI();