diff --git a/src/Type/TypeCombinator.php b/src/Type/TypeCombinator.php
index 454ca9717f..96a0d78466 100644
--- a/src/Type/TypeCombinator.php
+++ b/src/Type/TypeCombinator.php
@@ -95,6 +95,9 @@ public static function containsNull(Type $type): bool
 	public static function union(Type ...$types): Type
 	{
 		$typesCount = count($types);
+		if ($typesCount === 0) {
+			return new NeverType();
+		}
 
 		$benevolentTypes = [];
 		$benevolentUnionObject = null;
@@ -126,6 +129,10 @@ public static function union(Type ...$types): Type
 			$typesCount += count($typesInner) - 1;
 		}
 
+		if ($typesCount === 1) {
+			return $types[0];
+		}
+
 		$arrayTypes = [];
 		$arrayAccessoryTypes = [];
 		$scalarTypes = [];