@@ -320,11 +320,12 @@
 				[timersQueue removeListObject: listObject];
 			} else
 				timer = nil;
 		}
 
-		[timer fire];
+		if ([timer isValid])
+			[timer fire];
 
 		@synchronized (timersQueue) {
 			nextTimer = [[timersQueue firstObject] fireDate];
 		}