diff -r 7c83eb6a55bd -r bc26c42d2eec plugins/python/plc_python.c
--- a/plugins/python/plc_python.c	Wed Dec 09 00:56:18 2009 +0100
+++ b/plugins/python/plc_python.c	Wed Dec 09 01:11:48 2009 +0100
@@ -157,6 +157,8 @@
 	char* next_command;
 	PYTHON_EVAL* data__;
 	//printf("PythonIterator result %%s\n", result);
+    /*emergency exit*/
+    if(PythonState & PYTHON_FINISHED) return NULL;
 	/* take python mutex to prevent changing PLC data while PLC running */
 	LockPython();
 	/* Get current FB */