macosx: added sanity check to prevent a Cocoa runtime exception

diff --git a/modules/gui/macosx/Windows.m b/modules/gui/macosx/Windows.m
index 880084230343fa4c405207cb3556bf796db64539..30f61839387e22443abc44ef4615465071e5a6d3 100644 (file)
--- a/modules/gui/macosx/Windows.m
+++ b/modules/gui/macosx/Windows.m
@@ -270,6 +270,9 @@
 
 - (void)setTitle:(NSString *)title
 {
+    if (!title || [title length] < 1)
+        return;
+
     if (b_dark_interface && o_titlebar_view)
         [o_titlebar_view setWindowTitle: title];