src/backend/utils/adt/xml.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/backend/utils/adt/xml.c b/src/backend/utils/adt/xml.c
index 1ec6f1c2fd9..096d4d9813b 100644
--- a/src/backend/utils/adt/xml.c
+++ b/src/backend/utils/adt/xml.c
@@ -2762,6 +2762,11 @@ cursor_to_xmlschema(PG_FUNCTION_ARGS)
 				(errcode(ERRCODE_UNDEFINED_CURSOR),
 				 errmsg("cursor \"%s\" does not exist", name)));
 
+	if (portal->tupDesc == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_CURSOR_NAME),
+				 errmsg("cursor \"%s\" is invalid", name)));
+
 	xmlschema = _SPI_strdup(map_sql_table_to_xmlschema(portal->tupDesc,
 													   InvalidOid, nulls,
 													   tableforest, targetns));
--