diff --git a/libs/piqt/piqt.h b/libs/piqt/piqt.h
index 237f650..6e733a6 100644
--- a/libs/piqt/piqt.h
+++ b/libs/piqt/piqt.h
@@ -125,7 +125,7 @@ inline const PIVariantTypes::Color Q2PIColor(const QColor & v) {return PIVariant
 template<typename T>
 inline const QVector<T> PI2QVector(const PIVector<T> & v) {QVector<T> ret(v.size_s()); for (int i = 0; i < v.size_s(); ++i) ret[i] = v[i]; return ret;}
 template<typename T>
-inline const PIVector<T> Q2PIVector(const QVector<T> & v) {PIVector<T> ret(v.size_s()); for (int i = 0; i < v.size_s(); ++i) ret[i] = v[i]; return ret;}
+inline const PIVector<T> Q2PIVector(const QVector<T> & v) {if (v.isEmpty()) return PIVector<T>(); return PIVector<T>(v.constData(), (size_t)v.size());}
 
 
 inline PIPropertyStorage Q2PIPropertyStorage(const PropertyStorage & props) {