diff --git a/OMNotebook/OMNotebookGUI/cellapplication.cpp b/OMNotebook/OMNotebookGUI/cellapplication.cpp
index 0391c64c426..6315ff4be75 100644
--- a/OMNotebook/OMNotebookGUI/cellapplication.cpp
+++ b/OMNotebook/OMNotebookGUI/cellapplication.cpp
@@ -49,8 +49,6 @@
 
 #include <cstdlib>
 
-#include "omc_config.h"
-
 namespace IAEX
 {
   /*!
@@ -111,7 +109,7 @@ namespace IAEX
         }
     };
 
-  CellApplication::CellApplication( int &argc, char *argv[] )
+  CellApplication::CellApplication(int &argc, char *argv[], threadData_t *threadData)
     : QObject()
   {
     app_ = new MyApp(argc, argv, this);
@@ -151,6 +149,11 @@ namespace IAEX
     /* Force C-style doubles */
     setlocale(LC_NUMERIC, "C");
 
+    /* Don't move this line
+     * Is importat for threadData initialization
+     */
+    OmcInteractiveEnvironment *env = OmcInteractiveEnvironment::getInstance(threadData);
+
     // 2006-04-10 AF, use environment variable to find xml files
     QString openmodelica = OmcInteractiveEnvironment::OpenModelicaHome();
 
@@ -161,7 +164,6 @@ namespace IAEX
     }
 
     // Avoid cluttering the whole disk with omc temp-files
-    OmcInteractiveEnvironment *env = OmcInteractiveEnvironment::getInstance();
     env->evalExpression("setCommandLineOptions(\"+d=shortOutput\")");
     QString cmdLine = env->getResult();
     //cout << "Set shortOutput flag: " << cmdLine.toStdString() << std::endl;
diff --git a/OMNotebook/OMNotebookGUI/cellapplication.h b/OMNotebook/OMNotebookGUI/cellapplication.h
index a29ad59022e..25e04714fd6 100644
--- a/OMNotebook/OMNotebookGUI/cellapplication.h
+++ b/OMNotebook/OMNotebookGUI/cellapplication.h
@@ -59,6 +59,12 @@
 #include "documentview.h"
 #include "xmlnodename.h"
 
+extern "C" {
+#include "meta/meta_modelica.h"
+#include "omc_config.h"
+#include "gc.h"
+}
+
 namespace IAEX
 {
 
@@ -66,7 +72,7 @@ namespace IAEX
   {
     Q_OBJECT
   public:
-    CellApplication(int &argc, char *argv[]);
+    CellApplication(int &argc, char *argv[], threadData_t *threadData);
     virtual ~CellApplication();
 
     virtual CommandCenter *commandCenter();
diff --git a/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.cpp b/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.cpp
index 546f996a73a..59e755c8109 100644
--- a/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.cpp
+++ b/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.cpp
@@ -62,6 +62,7 @@ void (*omc_terminate)(FILE_INFO info,const char *msg,...) = omc_terminate_functi
 void (*omc_throw)(threadData_t*) __attribute__ ((noreturn)) = omc_throw_function;
 int omc_Main_handleCommand(void *threadData, void *imsg, void **omsg);
 void* omc_Main_init(void *threadData, void *args);
+void omc_System_initGarbageCollector(void *threadData);
 #ifdef WIN32
 void omc_Main_setWindowsPaths(threadData_t *threadData, void* _inOMHome);
 #endif
@@ -72,11 +73,11 @@ using namespace std;
 namespace IAEX
 {
   OmcInteractiveEnvironment* OmcInteractiveEnvironment::selfInstance = NULL;
-  OmcInteractiveEnvironment* OmcInteractiveEnvironment::getInstance()
+  OmcInteractiveEnvironment* OmcInteractiveEnvironment::getInstance(threadData_t *threadData)
   {
     if (selfInstance == NULL)
     {
-      selfInstance = new OmcInteractiveEnvironment();
+      selfInstance = new OmcInteractiveEnvironment(threadData);
     }
     return selfInstance;
   }
@@ -85,7 +86,7 @@ namespace IAEX
   *
   * \brief Implements evaluation for modelica code.
   */
-  OmcInteractiveEnvironment::OmcInteractiveEnvironment():result_(""),error_("")
+  OmcInteractiveEnvironment::OmcInteractiveEnvironment(threadData_t *threadData):threadData_(threadData),result_(""),error_("")
   {
     // set the language by reading the OMEdit settings file.
     QSettings settings(QSettings::IniFormat, QSettings::UserScope, "openmodelica", "omedit");
@@ -94,14 +95,13 @@ namespace IAEX
     void *args = mmc_mk_nil();
     QString locale = "+locale=" + settingsLocale.name();
     args = mmc_mk_cons(mmc_mk_scon(locale.toStdString().c_str()), args);
-    // initialize threadData
-    threadData_t *threadData = (threadData_t *) GC_malloc_uncollectable(sizeof(threadData_t));
+    // initialize garbage collector
+    omc_System_initGarbageCollector(NULL);
     MMC_TRY_TOP_INTERNAL()
     omc_Main_init(threadData, args);
-    MMC_CATCH_TOP()
-    threadData_ = threadData;
     threadData_->plotClassPointer = 0;
     threadData_->plotCB = 0;
+    MMC_CATCH_TOP()
     // set the +d=initialization flag default.
     evalExpression(QString("setCommandLineOptions(\"+d=initialization\")"));
 #ifdef WIN32
diff --git a/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.h b/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.h
index 513335db5f6..c6b9aadea8c 100644
--- a/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.h
+++ b/OMNotebook/OMNotebookGUI/omcinteractiveenvironment.h
@@ -43,13 +43,13 @@ namespace IAEX
   class OmcInteractiveEnvironment : public InputCellDelegate
   {
   private:
-    OmcInteractiveEnvironment();
+    OmcInteractiveEnvironment(threadData_t *threadData);
     virtual ~OmcInteractiveEnvironment();
 
   public:
     threadData_t *threadData_;
 
-    static OmcInteractiveEnvironment* getInstance();
+    static OmcInteractiveEnvironment* getInstance(threadData_t *threadData = 0);
     virtual QString getResult();
     virtual QString getError();
     virtual int getErrorLevel();
diff --git a/OMNotebook/OMNotebookGUI/qtapp.cpp b/OMNotebook/OMNotebookGUI/qtapp.cpp
index b0dec782afb..ca8d9a69391 100644
--- a/OMNotebook/OMNotebookGUI/qtapp.cpp
+++ b/OMNotebook/OMNotebookGUI/qtapp.cpp
@@ -60,7 +60,12 @@
 #include <sys/time.h>
 #endif
 
+#define GC_THREADS
+
+extern "C" {
 #include "meta/meta_modelica.h"
+}
+
 #include <locale.h>
 
 using namespace std;
@@ -81,10 +86,11 @@ int main(int argc, char *argv[])
 #endif
 
   MMC_INIT();
+  MMC_TRY_TOP()
 
   try
   {
-    CellApplication a(argc, argv);
+    CellApplication a(argc, argv, threadData);
     return a.exec();
   }
   catch(exception &e)
@@ -95,5 +101,7 @@ int main(int argc, char *argv[])
   }
 
   return 0;
+
+  MMC_CATCH_TOP();
 }