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nightowl888 pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/lucenenet.git

commit eda62018eaad15a3e2adc20cbb9e9429e82bf4d2
Author: Shad Storhaug <[email protected]>
AuthorDate: Tue Jul 9 10:05:36 2019 +0700

    BUG: Fixes BaseTestRangeFilter cleanup - safely call Dispose by ensuring 
the reference variable is not null
---
 src/Lucene.Net.Tests/Search/BaseTestRangeFilter.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Lucene.Net.Tests/Search/BaseTestRangeFilter.cs 
b/src/Lucene.Net.Tests/Search/BaseTestRangeFilter.cs
index 412ce9f..efea341 100644
--- a/src/Lucene.Net.Tests/Search/BaseTestRangeFilter.cs
+++ b/src/Lucene.Net.Tests/Search/BaseTestRangeFilter.cs
@@ -118,8 +118,8 @@ namespace Lucene.Net.Search
         {
             SignedIndexReader?.Dispose();
             UnsignedIndexReader?.Dispose();
-            SignedIndexDir.Index?.Dispose();
-            UnsignedIndexDir.Index?.Dispose();
+            SignedIndexDir?.Index?.Dispose();
+            UnsignedIndexDir?.Index?.Dispose();
             SignedIndexReader = null;
             UnsignedIndexReader = null;
             SignedIndexDir = null;

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