diff --git a/src/Cascade/CLCascadeNavigationController/CLCascadeView.m b/src/Cascade/CLCascadeNavigationController/CLCascadeView.m
index fc2d53f..a1eeef7 100644
--- a/src/Cascade/CLCascadeNavigationController/CLCascadeView.m
+++ b/src/Cascade/CLCascadeNavigationController/CLCascadeView.m
@@ -31,6 +31,7 @@ - (BOOL) pageExistAtIndex:(NSInteger)index;
 - (void) unloadInvisiblePagesOnStock;
 - (void) unloadPageIfNeeded:(NSInteger)index;
 
+- (NSInteger) normalizePageIndex:(NSInteger)index;
 - (CGSize) calculatePageSize:(UIView*)view;
 - (CGSize) calculateContentSize;
 - (UIEdgeInsets) calculateEdgeInset:(UIInterfaceOrientation)interfaceOrientation;
@@ -665,6 +666,11 @@ - (void) unloadPage:(UIView*)page remove:(BOOL)remove {
 }
 
 
+///////////////////////////////////////////////////////////////////////////////////////////////////
+- (NSInteger)normalizePageIndex:(NSInteger)index {
+    return MAX(0, MIN(index, [_pages count] -1));
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 - (CGSize) calculatePageSize:(UIView*)view {
     CLViewSize size = [(CLSegmentedView*)view viewSize];