Index: src/org/python/core/ThreadStateMapping.java
===================================================================
--- src/org/python/core/ThreadStateMapping.java	(revision 3911)
+++ src/org/python/core/ThreadStateMapping.java	(working copy)
@@ -58,7 +58,7 @@
             if (newSystemState == null) {
                 Py.writeDebug("threadstate", "no current system state");
                 // t.dumpStack();
-                newSystemState = Py.defaultSystemState;
+                newSystemState = new PySystemState();
             }
             ts = new ThreadState(t, newSystemState);
             // System.err.println("new ts: "+ts+", "+ts.systemState);
Index: src/org/python/core/ThreadStateMapping2.java
===================================================================
--- src/org/python/core/ThreadStateMapping2.java	(revision 3911)
+++ src/org/python/core/ThreadStateMapping2.java	(working copy)
@@ -14,7 +14,7 @@
         if (newSystemState == null) {
             Py.writeDebug("threadstate", "no current system state");
             // t.dumpStack();
-            newSystemState = Py.defaultSystemState;
+            newSystemState = new PySystemState();
         }
 
         ts = new ThreadState(t, newSystemState);