diff --git a/Source/NSNotificationCenter.m b/Source/NSNotificationCenter.m
index 6eaff4777..931e6f7a0 100644
--- a/Source/NSNotificationCenter.m
+++ b/Source/NSNotificationCenter.m
@@ -899,9 +899,8 @@ static NSNotificationCenter *default_center = nil;
 - (void) removeObserver: (id)observer
 {
   if (observer == nil)
-    [NSException raise: NSInvalidArgumentException
-		format: @"Nil observer passed to removeObserver:"];
-
+    return;
+  
   [self removeObserver: observer name: nil object: nil];
 }