diff --git a/src/Rules/NoMutableDateTimeStaticCallRule.php b/src/Rules/NoMutableDateTimeStaticCallRule.php
index c489841..b4840b9 100644
--- a/src/Rules/NoMutableDateTimeStaticCallRule.php
+++ b/src/Rules/NoMutableDateTimeStaticCallRule.php
@@ -38,6 +38,10 @@ public function processNode(Node $node, Scope $scope): array
 
         $class = $node->class->toString();
 
+        if (!$this->reflectionProvider->hasClass($class)) {
+            return [];
+        }
+
         if ($this->isAllowed($class)) {
             return [];
         }
diff --git a/src/Rules/NoMutableDateTimeUseRule.php b/src/Rules/NoMutableDateTimeUseRule.php
index 5777766..22905c3 100644
--- a/src/Rules/NoMutableDateTimeUseRule.php
+++ b/src/Rules/NoMutableDateTimeUseRule.php
@@ -34,6 +34,10 @@ public function processNode(Node $node, Scope $scope): array
     {
         $class = $node->name->toString();
 
+        if (!$this->reflectionProvider->hasClass($class)) {
+            return [];
+        }
+
         if ($this->isAllowed($class)) {
             return [];
         }
diff --git a/src/Rules/NoNewMutableDateTimeRule.php b/src/Rules/NoNewMutableDateTimeRule.php
index f7ceff0..ee533fd 100644
--- a/src/Rules/NoNewMutableDateTimeRule.php
+++ b/src/Rules/NoNewMutableDateTimeRule.php
@@ -38,6 +38,10 @@ public function processNode(Node $node, Scope $scope): array
 
         $class = $node->class->toString();
 
+        if (!$this->reflectionProvider->hasClass($class)) {
+            return [];
+        }
+
         if ($this->isAllowed($class)) {
             return [];
         }