diff --git a/lib/Database.php b/lib/Database.php
index 3608e21..d201875 100644
--- a/lib/Database.php
+++ b/lib/Database.php
@@ -1725,7 +1725,7 @@ class Database {
                         $w[] = "{$colDefs[$col]} <= ?";
                         $t[] = $type;
                         $v[] = $r[1];
-                    } elseif ($context->$m[1] === null) {
+                    } elseif ($r[1] === null) {
                         // range is open at the high end
                         $w[] = "{$colDefs[$col]} >= ?";
                         $t[] = $type;
diff --git a/tests/cases/Database/SeriesArticle.php b/tests/cases/Database/SeriesArticle.php
index b7d1eb0..a28ea59 100644
--- a/tests/cases/Database/SeriesArticle.php
+++ b/tests/cases/Database/SeriesArticle.php
@@ -530,6 +530,14 @@ trait SeriesArticle {
             'Excluding multiple folder trees including root'             => [(new Context)->not->folders([0,1,5]), []],
             'Before article 3'                                           => [(new Context)->not->articleRange(3, null), [1,2]],
             'Before article 19'                                          => [(new Context)->not->articleRange(null, 19), [20]],
+            'Marked or labelled in 2010 or 2015'                         => [(new Context)->markedRanges([["2010-01-01T00:00:00Z", "2010-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", "2015-12-31T23:59:59Z"]]), [2,4,6,8,20]],
+            'Not marked or labelled in 2010 or 2015'                     => [(new Context)->not->markedRanges([["2010-01-01T00:00:00Z", "2010-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", "2015-12-31T23:59:59Z"]]), [1,3,5,7,19]],
+            'Marked or labelled prior to 2010 or since 2015'             => [(new Context)->markedRanges([[null, "2009-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", null]]), [1,3,5,7,8,19]],
+            'Not marked or labelled prior to 2010 or since 2015'         => [(new Context)->not->markedRanges([[null, "2009-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", null]]), [2,4,6,20]],
+            'Modified in 2010 or 2015'                                   => [(new Context)->modifiedRanges([["2010-01-01T00:00:00Z", "2010-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", "2015-12-31T23:59:59Z"]]), [2,4,6,8,20]],
+            'Not modified in 2010 or 2015'                               => [(new Context)->not->modifiedRanges([["2010-01-01T00:00:00Z", "2010-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", "2015-12-31T23:59:59Z"]]), [1,3,5,7,19]],
+            'Modified prior to 2010 or since 2015'                       => [(new Context)->modifiedRanges([[null, "2009-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", null]]), [1,3,5,7,19]],
+            'Not modified prior to 2010 or since 2015'                   => [(new Context)->not->modifiedRanges([[null, "2009-12-31T23:59:59Z"], ["2015-01-01T00:00:00Z", null]]), [2,4,6,8,20]],
         ];
     }
 
@@ -1039,9 +1047,10 @@ trait SeriesArticle {
     public function provideArrayContextOptions(): iterable {
         foreach ([
             "articles", "editions",
-            "subscriptions", "foldersShallow", //"folders",
+            "subscriptions", "foldersShallow", "folders",
             "tags", "tagNames", "labels", "labelNames",
             "searchTerms", "authorTerms", "annotationTerms",
+            "modifiedRanges", "markedRanges",
         ] as $method) {
             yield [$method];
         }