diff --git a/platform/lvcs-impl/src/com/intellij/history/integration/ui/views/FileHistoryDialog.java b/platform/lvcs-impl/src/com/intellij/history/integration/ui/views/FileHistoryDialog.java
index bb7eb233304e..b6a9b27cf024 100644
--- a/platform/lvcs-impl/src/com/intellij/history/integration/ui/views/FileHistoryDialog.java
+++ b/platform/lvcs-impl/src/com/intellij/history/integration/ui/views/FileHistoryDialog.java
@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2009 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 
 package com.intellij.history.integration.ui.views;
 
@@ -24,6 +10,7 @@ import com.intellij.history.integration.IdeaGateway;
 import com.intellij.history.integration.ui.models.EntireFileHistoryDialogModel;
 import com.intellij.history.integration.ui.models.FileDifferenceModel;
 import com.intellij.history.integration.ui.models.FileHistoryDialogModel;
+import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.Disposer;
 import com.intellij.openapi.util.Pair;
@@ -53,7 +40,7 @@ public class FileHistoryDialog extends HistoryDialog<FileHistoryDialogModel> {
 
   @Override
   protected Pair<JComponent, Dimension> createDiffPanel(JPanel root, ExcludingTraversalPolicy traversalPolicy) {
-    myDiffPanel = DiffManager.getInstance().createRequestPanel(myProject, this, getFrame());
+    myDiffPanel = DiffManager.getInstance().createRequestPanel(myProject, this, ApplicationManager.getApplication().isUnitTestMode() ? null : getFrame());
     myDiffPanel.setRequest(new MessageDiffRequest(""));
     return Pair.create(myDiffPanel.getComponent(), null);
   }