diff -u libkdepim/addresseelineedit.cpp libkdepim/addresseelineedit.cpp
--- libkdepim/addresseelineedit.cpp	(revision 1019119)
+++ libkdepim/addresseelineedit.cpp	(revision 1019358)
@@ -800,7 +800,7 @@
 
 void AddresseeLineEdit::slotLDAPSearchData( const KPIM::LdapResultList &adrs )
 {
-  if ( s_LDAPLineEdit != this ) {
+  if ( adrs.isEmpty() || s_LDAPLineEdit != this ) {
     return;
   }
 
@@ -817,7 +817,8 @@
     setText( m_previousAddresses + m_searchString );
     // only complete again if the user didn't change the selection while
     // we were waiting; otherwise the completion box will be closed
-    if ( m_searchString.trimmed() != completionBox()->currentItem()->text().trimmed() ) {
+    QListWidgetItem *current = completionBox()->currentItem();
+    if ( !current || m_searchString.trimmed() != current->text().trimmed() ) {
       doCompletion( m_lastSearchMode );
     }
   }