diff --git a/mailpoet/lib/Automation/Engine/Validation/WorkflowRules/ConsistentStepMapRule.php b/mailpoet/lib/Automation/Engine/Validation/WorkflowRules/ConsistentStepMapRule.php
new file mode 100644
index 0000000000..ad8d82252a
--- /dev/null
+++ b/mailpoet/lib/Automation/Engine/Validation/WorkflowRules/ConsistentStepMapRule.php
@@ -0,0 +1,24 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Automation\Engine\Validation\WorkflowRules;
+
+use MailPoet\Automation\Engine\Data\Workflow;
+use MailPoet\Automation\Engine\Exceptions;
+use MailPoet\Automation\Engine\Validation\WorkflowGraph\WorkflowNode;
+use MailPoet\Automation\Engine\Validation\WorkflowGraph\WorkflowNodeVisitor;
+
+class ConsistentStepMapRule implements WorkflowNodeVisitor {
+  public function initialize(Workflow $workflow): void {
+    foreach ($workflow->getSteps() as $id => $step) {
+      if ($id !== $step->getId()) {
+        throw Exceptions::workflowStructureNotValid(__('TODO', 'mailpoet'));
+      }
+    }
+  }
+
+  public function visitNode(Workflow $workflow, WorkflowNode $node): void {
+  }
+
+  public function complete(Workflow $workflow): void {
+  }
+}
diff --git a/mailpoet/tests/unit/Automation/Engine/Validation/WorkflowRules/ConsistentStepMapRuleTest.php b/mailpoet/tests/unit/Automation/Engine/Validation/WorkflowRules/ConsistentStepMapRuleTest.php
new file mode 100644
index 0000000000..d760719627
--- /dev/null
+++ b/mailpoet/tests/unit/Automation/Engine/Validation/WorkflowRules/ConsistentStepMapRuleTest.php
@@ -0,0 +1,30 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Automation\Engine\Validation\WorkflowRules;
+
+require_once __DIR__ . '/WorkflowRuleTest.php';
+
+use MailPoet\Automation\Engine\Data\Workflow;
+use MailPoet\Automation\Engine\Exceptions\UnexpectedValueException;
+use MailPoet\Automation\Engine\Validation\WorkflowGraph\WorkflowWalker;
+
+class ConsistentStepMapRuleTest extends WorkflowRuleTest {
+  public function testItDetectsWrongKeyValuePair(): void {
+    $workflow = $this->make(Workflow::class, ['getSteps' => [
+      'root' => $this->createStep('a'),
+    ]]);
+
+    $this->expectException(UnexpectedValueException::class);
+    $this->expectExceptionMessage('Invalid workflow structure: TODO');
+    (new WorkflowWalker())->walk($workflow, [new ConsistentStepMapRule()]);
+  }
+
+  public function testItPassesWithCorrectKeyValuePair(): void {
+    $workflow = $this->make(Workflow::class, ['getSteps' => [
+      'root' => $this->createStep('root'),
+    ]]);
+
+    (new WorkflowWalker())->walk($workflow, [new ConsistentStepMapRule()]);
+    // no exception thrown
+  }
+}