diff --git a/src/parse-util.c b/src/parse-util.c
index 184b597d5d936a9a3e14b1763759922d18981b2c..b8af45796dbd46e4ad4da42f500e62303d484d6b 100644
--- a/src/parse-util.c
+++ b/src/parse-util.c
@@ -86,7 +86,8 @@ cellref_name (CellRef const *cell_ref, ParsePos const *pp, gboolean no_sheetname
 
 	/* If it is a non-local reference, add the path to the external sheet */
 	if (sheet != NULL && !no_sheetname) {
-		if (sheet->workbook == pp->wb)
+		/* pp->wb==NULL happens for the leak printer.  */
+		if (pp->wb == NULL || sheet->workbook == pp->wb)
 			return g_strconcat (sheet->name_quoted, "!", buffer, NULL);
 		return g_strconcat ("[", sheet->workbook->filename, "]",
 				    sheet->name_quoted, "!", buffer, NULL);