1 files changed, 2 insertions, 0 deletions
diff --git a/git-debrebase b/git-debrebase
index 3be444b..165dc66 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -196,6 +196,8 @@ sub get_tree ($;$$) {
 	return () if $type eq 'missing';
     }
 
+    confess "get_tree needs object not $x ?" unless $x =~ m{^[0-9a-f]+\:};
+
     our (@get_tree_memo, %get_tree_memo);
     my $memo = $get_tree_memo{$x};
     return @$memo if $memo;