From b6805da8b0163dde258ef56dcbdd94a86d300b84 Mon Sep 17 00:00:00 2001
From: Julia Beliaeva <Julia.Beliaeva@jetbrains.com>
Date: Wed, 5 Jul 2017 17:41:44 +0300
Subject: [PATCH] [vcs-log] diagnostic for illegal argument exception EA-100051

---
 .../src/com/intellij/vcs/log/impl/VcsLogContentProvider.java   | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/platform/vcs-log/impl/src/com/intellij/vcs/log/impl/VcsLogContentProvider.java b/platform/vcs-log/impl/src/com/intellij/vcs/log/impl/VcsLogContentProvider.java
index e6c8a27ca593..e054b4e89a81 100644
--- a/platform/vcs-log/impl/src/com/intellij/vcs/log/impl/VcsLogContentProvider.java
+++ b/platform/vcs-log/impl/src/com/intellij/vcs/log/impl/VcsLogContentProvider.java
@@ -16,6 +16,7 @@
 package com.intellij.vcs.log.impl;
 
 import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.Condition;
 import com.intellij.openapi.vcs.ProjectLevelVcsManager;
@@ -49,6 +50,7 @@ import java.util.List;
  * Delegates to the VcsLogManager.
  */
 public class VcsLogContentProvider implements ChangesViewContentProvider {
+  private static final Logger LOG = Logger.getInstance(VcsLogContentProvider.class);
   public static final String TAB_NAME = "Log";
 
   @NotNull private final Project myProject;
@@ -167,6 +169,7 @@ public class VcsLogContentProvider implements ChangesViewContentProvider {
       for (String tabName : logManager.getTabNames()) {
         if (!TAB_NAME.equals(tabName)) { // main tab is closed by the ChangesViewContentManager
           Content content = toolWindow.getContentManager().findContent(tabName);
+          LOG.assertTrue(content != null, "Could not find content for tab " + tabName);
           ContentsUtil.closeContentTab(toolWindow.getContentManager(), content);
         }
       }