diff --git a/src/parser/query_builder.cpp b/src/parser/query_builder.cpp
index eea6b8d2..a0746f65 100644
--- a/src/parser/query_builder.cpp
+++ b/src/parser/query_builder.cpp
@@ -426,37 +426,50 @@ void do_add_comparison_to_query(Query &query, const Schema &schema, const Object
 template<typename T>
 void do_add_null_comparison_to_query(Query &query, Predicate::Operator op, const PropertyExpression &expr, Arguments &args)
 {
-    static realm::null null = realm::null();
     Columns<T> column = expr.table_getter()->template column<T>(expr.prop->table_column);
-
     switch (op) {
         case Predicate::Operator::NotEqual:
-            query.and_query(column != null);
+            query.and_query(column != realm::null());
         case Predicate::Operator::Equal:
-            query.and_query(column == null);
+            query.and_query(column == realm::null());
             break;
         default:
-            throw std::runtime_error("Only 'equal' and 'not equal' operators supported for object comparison.");
+            throw std::runtime_error("Only 'equal' and 'not equal' operators supported when comapring against 'null'.");
     }
 }
     
 template<>
 void do_add_null_comparison_to_query<Binary>(Query &query, Predicate::Operator op, const PropertyExpression &expr, Arguments &args)
 {
-    static realm::null null = realm::null();
+    precondition(expr.indexes.empty(), "KeyPath queries not supported for data comparisons.");
     Columns<Binary> column = expr.table_getter()->template column<Binary>(expr.prop->table_column);
-    
     switch (op) {
         case Predicate::Operator::NotEqual:
-            query.not_equal(expr.prop->table_column, null);
+            query.not_equal(expr.prop->table_column, realm::null());
         case Predicate::Operator::Equal:
-            query.equal(expr.prop->table_column, null);
+            query.equal(expr.prop->table_column, realm::null());
+            break;
+        default:
+            throw std::runtime_error("Only 'equal' and 'not equal' operators supported when comapring against 'null'.");
+    }
+}
+    
+template<>
+void do_add_null_comparison_to_query<Link>(Query &query, Predicate::Operator op, const PropertyExpression &expr, Arguments &args)
+{
+    precondition(expr.indexes.empty(), "KeyPath queries not supported for object comparisons.");
+    switch (op) {
+        case Predicate::Operator::NotEqual:
+            query.Not();
+        case Predicate::Operator::Equal:
+            query.and_query(query.get_table()->column<Link>(expr.prop->table_column).is_null());
             break;
         default:
             throw std::runtime_error("Only 'equal' and 'not equal' operators supported for object comparison.");
     }
 }
 
+
 void do_add_null_comparison_to_query(Query &query, const Schema &schema, const ObjectSchema &object_schema, Predicate::Comparison cmp,
                                      const PropertyExpression &expr, Arguments &args)
 {
@@ -481,20 +494,10 @@ void do_add_null_comparison_to_query(Query &query, const Schema &schema, const O
             do_add_null_comparison_to_query<String>(query, cmp.op, expr, args);
             break;
         case PropertyTypeData:
-            precondition(expr.indexes.empty(), "KeyPath queries not supported for data comparisons.");
             do_add_null_comparison_to_query<Binary>(query, cmp.op, expr, args);
             break;
         case PropertyTypeObject:
-            precondition(expr.indexes.empty(), "KeyPath queries not supported for object comparisons.");
-            switch (cmp.op) {
-                case Predicate::Operator::NotEqual:
-                    query.Not();
-                case Predicate::Operator::Equal:
-                    query.and_query(query.get_table()->column<Link>(expr.prop->table_column).is_null());
-                    break;
-                default:
-                    throw std::runtime_error("Only 'equal' and 'not equal' operators supported for object comparison.");
-            }
+            do_add_null_comparison_to_query<Link>(query, cmp.op, expr, args);
             break;
         case PropertyTypeArray:
             throw std::runtime_error((std::string)"Comparing Lists to 'null' is not supported");
diff --git a/tests/query.json b/tests/query.json
index e4edd4de..22ef1c72 100644
--- a/tests/query.json
+++ b/tests/query.json
@@ -245,6 +245,9 @@
         ["QueryCount", 1, "LinkObject", "linkCol == $0", [0, "linkCol"]],
         ["QueryCount", 1, "LinkObject", "$0 == linkCol", [1, "linkCol"]],
         ["QueryCount", 2, "LinkObject", "linkCol != $0", [0, "linkCol"]],
+        ["QueryCount", 1, "LinkObject", "linkCol = null"],
+        ["QueryCount", 2, "LinkObject", "linkCol != NULL"],
+        ["QueryCount", 1, "LinkObject", "linkCol = $0", null],
 
         ["QueryThrows", "LinkObject", "linkCol > $0", [0, "linkCol"]],
         ["QueryThrows", "LinkObject", "intCol = $0", [0, "linkCol"]]
@@ -317,6 +320,49 @@
         ["ObjectSet", [1],    "LinkTypesObject", "linkLink.basicLink.floatCol == 0.1"],
         ["ObjectSet", [1, 3], "LinkTypesObject", "linkLink.basicLink.floatCol > 0"]
     ]
+},
+
+"optionalTests" : {
+    "schema" : [
+    { 
+        "name": "OptionalTypesObject",  
+        "primaryKey": "primaryKey",
+        "properties": [
+            { "name": "primaryKey", "type": "int" },
+            { "name": "intCol",     "type": "int",      "optional": true },
+            { "name": "floatCol",   "type": "float",    "optional": true },
+            { "name": "doubleCol",  "type": "double",   "optional": true },
+            { "name": "stringCol",  "type": "string",   "optional": true },
+            { "name": "dateCol",    "type": "date",     "optional": true },
+            { "name": "dataCol",    "type": "data",     "optional": true }
+        ]
+    }, 
+    {
+        "name": "LinkTypesObject",
+        "primaryKey": "primaryKey",
+        "properties": [
+            { "name": "primaryKey", "type": "int" },
+            { "name": "basicLink",  "type": "object", "objectType": "OptionalTypesObject" }
+        ]
+    }],
+    "objects": [
+        { "type": "LinkTypesObject", "value": [0, [0, 1, 0.1, 0.001, "1", 1, [1, 10, 100]]] },
+        { "type": "LinkTypesObject", "value": [1, [1, null, null, null, null, null, null]] }
+    ],
+    "tests": [
+        ["ObjectSet", [1], "OptionalTypesObject", "intCol == null"],
+        ["ObjectSet", [0], "OptionalTypesObject", "intCol != null"],
+        ["ObjectSet", [1], "OptionalTypesObject", "floatCol == null"],
+        ["ObjectSet", [0], "OptionalTypesObject", "floatCol != null"],
+        ["ObjectSet", [1], "OptionalTypesObject", "doubleCol == null"],
+        ["ObjectSet", [0], "OptionalTypesObject", "doubleCol != null"],
+        ["ObjectSet", [1], "OptionalTypesObject", "stringCol == null"],
+        ["ObjectSet", [0], "OptionalTypesObject", "stringCol != null"],
+        ["ObjectSet", [1], "OptionalTypesObject", "dateCol == null"],
+        ["ObjectSet", [0], "OptionalTypesObject", "dateCol != null"],
+        ["ObjectSet", [1], "OptionalTypesObject", "dataCol == null"],
+        ["ObjectSet", [0], "OptionalTypesObject", "dataCol != null"]
+    ]
 }
 
 }