diff --git a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Schemas/GraphQLSchema.inc b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Schemas/GraphQLSchema.inc
index 10b9d9e6..25562bd5 100644
--- a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Schemas/GraphQLSchema.inc
+++ b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Schemas/GraphQLSchema.inc
@@ -127,8 +127,8 @@ class GraphQLSchema extends Schema {
             $type = Type::listOf($type);
         }
 
-        # Make this field non-nullable if it is required
-        if ($field->required and !$ignore_required) {
+        # Make this field non-nullable if it is required and unconditional
+        if ($field->required and !$field->conditions and !$ignore_required) {
             $type = Type::nonNull($type);
         }
 
diff --git a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsGraphQLTestCase.inc b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsGraphQLTestCase.inc
index 7521b035..cb1147e8 100644
--- a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsGraphQLTestCase.inc
+++ b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsGraphQLTestCase.inc
@@ -388,4 +388,17 @@ class APIModelsGraphQLTestCase extends TestCase {
             },
         );
     }
+
+    /**
+     * Ensure we can query for model fields that are conditionally required. Regression test for #778
+     */
+    public function test_query_conditionally_required_field(): void {
+        # Query for interfaces including conditionally required fields and ensure no errors are returned.
+        $graphql = new GraphQL(
+            query: 'query {queryInterfaces {id ipaddr subnet descr typev4 track6_interface}}',
+            client: $this->auth,
+        );
+        $graphql->create();
+        $this->assert_is_empty($graphql->result->value['errors'] ?? []);
+    }
 }