--- base.py.old		2009-06-25 01:33:56.000000000 +0300
+++ base.py		2009-06-25 01:45:52.000000000 +0300
@@ -23,6 +23,10 @@
     fcntl = None
 import traceback
 
+def validfloat(x,msg=None):
+    return repr(x)!='nan'
+
+
 from twisted.internet.interfaces import IReactorCore, IReactorTime, IReactorThreads
 from twisted.internet.interfaces import IResolverSimple, IReactorPluggableResolver
 from twisted.internet.interfaces import IConnector, IDelayedCall
@@ -63,6 +67,7 @@
             used to determine the current time any time that information is
             needed.
         """
+        assert validfloat(time)
         self.time, self.func, self.args, self.kw = time, func, args, kw
         self.resetter = reset
         self.canceller = cancel
@@ -79,6 +84,8 @@
         @return: The number of seconds after the epoch at which this call is
         scheduled to be made.
         """
+        assert validfloat(self.time)
+        assert validfloat(self.delayed_time)
         return self.time + self.delayed_time
 
     def cancel(self):
@@ -115,13 +122,16 @@
         elif self.called:
             raise error.AlreadyCalled
         else:
+            assert validfloat(secondsFromNow)
             newTime = self.seconds() + secondsFromNow
             if newTime < self.time:
                 self.delayed_time = 0
                 self.time = newTime
+                assert validfloat(self.time)
                 self.resetter(self)
             else:
                 self.delayed_time = newTime - self.time
+                assert validfloat(self.delayed_time)
 
     def delay(self, secondsLater):
         """Reschedule this call for a later time
@@ -138,13 +148,16 @@
         elif self.called:
             raise error.AlreadyCalled
         else:
+            assert validfloat(secondsLater)
             self.delayed_time += secondsLater
             if self.delayed_time < 0:
                 self.activate_delay()
                 self.resetter(self)
+            assert validfloat(self.time)
 
     def activate_delay(self):
         self.time += self.delayed_time
+        assert validfloat(self.time)
         self.delayed_time = 0
 
     def active(self):
@@ -651,6 +664,10 @@
         assert callable(_f), "%s is not callable" % _f
         assert sys.maxint >= _seconds >= 0, \
                "%s is not greater than or equal to 0 seconds" % (_seconds,)
+
+        assert validfloat(_seconds)
+        assert repr(self.seconds())!='nan', 'self.seconds() [really: %r] returned NaN! %r,%r,%r'%(self.seconds,self.seconds(),self.seconds(),self.seconds())
+
         tple = DelayedCall(self.seconds() + _seconds, _f, args, kw,
                            self._cancelCallLater,
                            self._moveCallLaterSooner,
@@ -741,6 +758,11 @@
         self._insertNewDelayedCalls()
 
         now = self.seconds()
+
+        if self._pendingTimedCalls and repr(self._pendingTimedCalls[0].time)=='nan':
+    	    print 'NAN TIME DETECTED', repr(self._pendingTimedCalls[0].time), self._pendingTimedCalls[0].__dict__
+    	    self._pendingTimedCalls[0].time=0
+
         while self._pendingTimedCalls and (self._pendingTimedCalls[0].time <= now):
             call = heappop(self._pendingTimedCalls)
             if call.cancelled: