Fix

Author: samsonasik

rules/CodeQuality/Rector/MethodCall/AssertCountWithZeroToAssertEmptyRector.php

@@ -75,6 +75,11 @@ public function refactor(Node $node): MethodCall|StaticCall|null
             return null;
         }
 
+        $secondType  = $this->getType($node->getArgs()[1]->value);
+        if ($secondType instanceof UnionType) {
+            return null;
+        }
+
         $value = ($type->getConstantScalarValues()[0] ?? null);
         if ($value === 0) {
             $args = $node->getArgs();