Do not allow more than 2 instances of QCoreApplication (or QApplication).

1 files changed, 5 insertions, 0 deletions

diff --git a/PySide/QtCore/glue/qcoreapplication_impl.cpp b/PySide/QtCore/glue/qcoreapplication_impl.cpp
index 70f06cb34..b6d3bf731 100644
--- a/PySide/QtCore/glue/qcoreapplication_impl.cpp
+++ b/PySide/QtCore/glue/qcoreapplication_impl.cpp
@@ -1,5 +1,10 @@
 int SbkQCoreApplication_Init(PyObject* self, PyObject* args, PyObject*)
 {
+    if (QCoreApplication::instance()) {
+        PyErr_SetString(PyExc_RuntimeError, "A QCoreApplication instance already exists.");
+        return -1;
+    }
+
     int numArgs = PyTuple_GET_SIZE(args);
     if (numArgs != 1) {
         PyErr_BadArgument();