diff --git a/milli/tests/search/filters.rs b/milli/tests/search/filters.rs
index 18de24ac3..0b5296b82 100644
--- a/milli/tests/search/filters.rs
+++ b/milli/tests/search/filters.rs
@@ -82,10 +82,17 @@ test_filter!(
     vec![Left(vec!["tag=red", "tag=green"]), Left(vec!["asc_desc_rank<3", "asc_desc_rank<1"])]
 );
 test_filter!(exists_filter_1, vec![Right("opt1 EXISTS")]);
+test_filter!(exists_filter_2, vec![Right("opt1.opt2 EXISTS")]);
 test_filter!(exists_filter_1_not, vec![Right("opt1 NOT EXISTS")]);
 test_filter!(exists_filter_1_not_alt, vec![Right("NOT opt1 EXISTS")]);
 test_filter!(exists_filter_1_double_not, vec![Right("NOT opt1 NOT EXISTS")]);
 
+test_filter!(null_filter_1, vec![Right("opt1 NULL")]);
+test_filter!(null_filter_2, vec![Right("opt1.opt2 NULL")]);
+test_filter!(null_filter_1_not, vec![Right("opt1 NOT NULL")]);
+test_filter!(null_filter_1_not_alt, vec![Right("NOT opt1 NULL")]);
+test_filter!(null_filter_1_double_not, vec![Right("NOT opt1 NOT NULL")]);
+
 test_filter!(in_filter, vec![Right("tag_in IN[1, 2, 3, four, five]")]);
 test_filter!(not_in_filter, vec![Right("tag_in NOT IN[1, 2, 3, four, five]")]);
 test_filter!(not_not_in_filter, vec![Right("NOT tag_in NOT IN[1, 2, 3, four, five]")]);
diff --git a/milli/tests/search/mod.rs b/milli/tests/search/mod.rs
index 18c74e344..e67c1bc64 100644
--- a/milli/tests/search/mod.rs
+++ b/milli/tests/search/mod.rs
@@ -205,6 +205,18 @@ fn execute_filter(filter: &str, document: &TestDocument) -> Option<String> {
         } else if let Some(opt1) = &document.opt1 {
             id = contains_key_rec(opt1, "opt2").then(|| document.id.clone());
         }
+    } else if matches!(filter, "opt1 NULL" | "NOT opt1 NOT NULL") {
+        id = document.opt1.as_ref().map_or(false, |v| v.is_null()).then(|| document.id.clone());
+    } else if matches!(filter, "NOT opt1 NULL" | "opt1 NOT NULL") {
+        id = document.opt1.as_ref().map_or(true, |v| !v.is_null()).then(|| document.id.clone());
+    } else if matches!(filter, "opt1.opt2 NULL") {
+        if document.opt1opt2.as_ref().map_or(false, |v| v.is_null()) {
+            id = Some(document.id.clone());
+        } else if let Some(opt1) = &document.opt1 {
+            if !opt1.is_null() {
+                id = contains_null_rec(opt1, "opt2").then(|| document.id.clone());
+            }
+        }
     } else if matches!(
         filter,
         "tag_in IN[1, 2, 3, four, five]" | "NOT tag_in NOT IN[1, 2, 3, four, five]"
@@ -240,6 +252,28 @@ pub fn contains_key_rec(v: &serde_json::Value, key: &str) -> bool {
     }
 }
 
+pub fn contains_null_rec(v: &serde_json::Value, key: &str) -> bool {
+    match v {
+        serde_json::Value::Object(v) => {
+            for (k, v) in v.iter() {
+                if k == key && v.is_null() || contains_null_rec(v, key) {
+                    return true;
+                }
+            }
+            false
+        }
+        serde_json::Value::Array(v) => {
+            for v in v.iter() {
+                if contains_null_rec(v, key) {
+                    return true;
+                }
+            }
+            false
+        }
+        _ => false,
+    }
+}
+
 pub fn expected_filtered_ids(filters: Vec<Either<Vec<&str>, &str>>) -> HashSet<String> {
     let dataset: Vec<TestDocument> =
         serde_json::Deserializer::from_str(CONTENT).into_iter().map(|r| r.unwrap()).collect();