Add null check in Contains() method

Commit migrated from https://github.com/dotnet/corefx/commit/5c9ac81ed5cef7b17b0e5a432e7c0a0a4688a81a

diff --git a/src/libraries/System.Collections.Specialized/src/System/Collections/Specialized/OrderedDictionary.cs b/src/libraries/System.Collections.Specialized/src/System/Collections/Specialized/OrderedDictionary.cs
index c4b38fb..07066b0 100644 (file)
--- a/src/libraries/System.Collections.Specialized/src/System/Collections/Specialized/OrderedDictionary.cs
+++ b/src/libraries/System.Collections.Specialized/src/System/Collections/Specialized/OrderedDictionary.cs
@@ -274,7 +274,11 @@ namespace System.Collections.Specialized
         /// </devdoc>
         public bool Contains(object key)
         {
-            return objectsTable.Contains(key);
+            if (_objectsTable == null)
+            {
+                return false;
+            }
+            return _objectsTable.Contains(key);
         }
 
         /// <devdoc>