diff --git a/tests/acceptance/GherkinParamConfig.feature b/tests/acceptance/GherkinParamConfig.feature
index f9399e3..3d9c768 100644
--- a/tests/acceptance/GherkinParamConfig.feature
+++ b/tests/acceptance/GherkinParamConfig.feature
@@ -122,3 +122,30 @@ Feature: Parametrize Gherkin Feature (Config)
       """
     When I execute a scenario calling the parameter 'config:not_a_param'
     Then I should see "{{config:not_a_param}}" is null
+
+  Scenario: Config key not exists (expect null)
+    Given I have a configuration file "codeception.yml"
+          """
+          actor: Tester
+
+          paths:
+            tests: tests
+            log: tests/_output
+            data: tests/_data
+            support: tests/_support
+            envs: tests/_envs
+
+          settings:
+            bootstrap: _bootstrap.php
+            colors: true
+            memory_limit: 512M
+            my_edgecase:
+              0:
+                user: 'edgecase'
+
+          extensions:
+              enabled:
+                  - Codeception\Extension\GherkinParam
+          """
+    When I execute a scenario calling the parameter 'my_edgecase:1:user'
+    Then I should see "{{config:my_edgecase:1:user}}" equals "edgecase"