bug fixed in prompt count after traceback

IPython/frontend/terminal/frontend.py

@@ -154,6 +154,7 b' class Frontend(object):'
 		     print >> sys.stderr, etb[0]
 		     print >> sys.stderr, etb[1]
 		     print >> sys.stderr, etb[2]
+		     self.prompt_count = self.msg_xreq["content"]["execution_count"]+1
                      break
 	   time.sleep(0.1)