try suggestions

Author: staabm

src/Analyser/TypeSpecifier.php

@@ -1588,6 +1588,7 @@ private function getConditionalSpecifiedTypes(
 			(
 				$argumentExpr instanceof Node\Scalar
 				|| ($argumentExpr instanceof ConstFetch && in_array(strtolower($argumentExpr->name->toString()), ['true', 'false', 'null'], true))
+				&& ($ifType instanceof NeverType || $elseType instanceof NeverType)
 			)
 		) {
 			return null;