diff --git a/Source/CKCalendarView.m b/Source/CKCalendarView.m
index e79e5ac..fec2bbc 100644
--- a/Source/CKCalendarView.m
+++ b/Source/CKCalendarView.m
@@ -480,7 +480,7 @@ - (void)_dateButtonPressed:(id)sender {
     }
 
     [self selectDate:date makeVisible:YES];
-    [self.delegate calendar:self didSelectDate:date];
+    if ([self.delegate respondsToSelector:@selector(didSelectDate:)]) { [self.delegate calendar:self didSelectDate:date]; }
     [self setNeedsLayout];
 }