diff --git a/3rdparty/pythonqt/src/PythonQtConversion.cpp b/3rdparty/pythonqt/src/PythonQtConversion.cpp
index 0fbe291..7ea97c4 100644
--- a/3rdparty/pythonqt/src/PythonQtConversion.cpp
+++ b/3rdparty/pythonqt/src/PythonQtConversion.cpp
@@ -519,8 +519,13 @@ void* PythonQtConv::ConvertPythonToQt(const PythonQtMethodInfo::ParameterInfo& i
        {
          QByteArray bytes = PyObjGetBytes(obj, strict, ok);
          if (ok) {
-           PythonQtValueStorage_ADD_VALUE_IF_NEEDED(alreadyAllocatedCPPObject,global_variantStorage, QVariant, QVariant(bytes), ptr);
-           ptr = (void*)((QVariant*)ptr)->constData();
+           if (alreadyAllocatedCPPObject) {
+             ptr = alreadyAllocatedCPPObject;
+             *reinterpret_cast<QByteArray*>(alreadyAllocatedCPPObject) = bytes;
+           } else {
+             PythonQtValueStorage_ADD_VALUE_IF_NEEDED(alreadyAllocatedCPPObject,global_variantStorage, QVariant, QVariant(bytes), ptr);
+             ptr = (void*)((QVariant*)ptr)->constData();
+           }
          }
        }
        break;
@@ -528,8 +533,13 @@ void* PythonQtConv::ConvertPythonToQt(const PythonQtMethodInfo::ParameterInfo& i
        {
          QString str = PyObjGetString(obj, strict, ok);
          if (ok) {
-           PythonQtValueStorage_ADD_VALUE_IF_NEEDED(alreadyAllocatedCPPObject,global_variantStorage, QVariant, QVariant(str), ptr);
-           ptr = (void*)((QVariant*)ptr)->constData();
+           if (alreadyAllocatedCPPObject) {
+             ptr = alreadyAllocatedCPPObject;
+             *reinterpret_cast<QString*>(alreadyAllocatedCPPObject) = str;
+           } else {
+             PythonQtValueStorage_ADD_VALUE_IF_NEEDED(alreadyAllocatedCPPObject,global_variantStorage, QVariant, QVariant(str), ptr);
+             ptr = (void*)((QVariant*)ptr)->constData();
+           }
          }
        }
        break;
@@ -537,8 +547,13 @@ void* PythonQtConv::ConvertPythonToQt(const PythonQtMethodInfo::ParameterInfo& i
        {
          QStringList l = PyObjToStringList(obj, strict, ok);
          if (ok) {
-           PythonQtValueStorage_ADD_VALUE_IF_NEEDED(alreadyAllocatedCPPObject,global_variantStorage, QVariant, QVariant(l), ptr);
-           ptr = (void*)((QVariant*)ptr)->constData();
+           if (alreadyAllocatedCPPObject) {
+             ptr = alreadyAllocatedCPPObject;
+             *reinterpret_cast<QStringList*>(alreadyAllocatedCPPObject) = l;
+           } else {
+             PythonQtValueStorage_ADD_VALUE_IF_NEEDED(alreadyAllocatedCPPObject,global_variantStorage, QVariant, QVariant(l), ptr);
+             ptr = (void*)((QVariant*)ptr)->constData();
+           }
          }
        }
        break;