X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=dbsrgits%2FDBIx-Class.git;a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FResultSet.pm;h=d8835510087872c96a6ed49a7eeec88fe31dfc59;hp=dee7c3090737bd0287b6865b06d66303f68cdd7a;hb=8bc474676193d8832932f01cc60f85e7c1d44c76;hpb=6c30f9c308d6c2f2d6ad82bce84dc70cbd408852

diff --git a/lib/DBIx/Class/ResultSet.pm b/lib/DBIx/Class/ResultSet.pm
index dee7c30..d883551 100644
--- a/lib/DBIx/Class/ResultSet.pm
+++ b/lib/DBIx/Class/ResultSet.pm
@@ -3440,6 +3440,7 @@ sub _merge_joinpref_attr {
       $position++;
     }
     my ($import_key) = ( ref $import_element eq 'HASH' ) ? keys %{$import_element} : ($import_element);
+    $import_key = '' if not defined $import_key;
 
     if ($best_candidate->{score} == 0 || exists $seen_keys->{$import_key}) {
       push( @{$orig}, $import_element );