commit c28527b1340c51f2b492a31e49127106cebbfc5d
Author: Jeremy Huddleston <jeremyhu@apple.com>
Date:   Fri Jun 1 10:38:37 2012 -0700

    Fix a crash when minimizing windows without titles
    
    <rdar://problem/11575791>
    
    Regression-from: 21f210c923aa5d79400ce46275084f2636c92bd9
    
    Signed-off-by: Jeremy Huddleston <jeremyhu@apple.com>

diff --git a/src/x-window.m b/src/x-window.m
index a210c6a..e3b9066 100644
--- a/src/x-window.m
+++ b/src/x-window.m
@@ -2139,7 +2139,7 @@ - (void) do_collapse
     if (wid == XP_NULL_NATIVE_WINDOW_ID)
         return;
 
-    title_c = strdup([_title UTF8String]);
+    title_c = strdup([[self title] UTF8String]);
     assert(title_c);
 
     err = qwm_dock_minimize_item_with_title_async (wid, title_c);