Mine

Index: kcmultiwidget.cpp
===================================================================
--- kcmultiwidget.cpp   (revision 737084)
+++ kcmultiwidget.cpp   (working copy)
@@ -348,12 +348,15 @@

        ModuleList::Iterator end = m_modules.end();
        int buttons = 0;
+        bool found = false;
        for( ModuleList::Iterator it = m_modules.begin(); it != end; ++it ) {
                if( ( *it ).kcm==d->currentModule) {
                        showButton(User3, ( *it ).adminmode);
                        buttons = ( *it ).buttons;
+                        found = true;
                }
        }
+        Q_ASSERT(found);

         showButton(Apply, buttons & KCModule::Apply);
         showButton(User1, buttons & KCModule::Apply);   // Reset button.