diff --git a/fe/fe-core/src/main/cup/sql_parser.cup b/fe/fe-core/src/main/cup/sql_parser.cup
index bee869915a2383..51aae6ad6afa01 100644
--- a/fe/fe-core/src/main/cup/sql_parser.cup
+++ b/fe/fe-core/src/main/cup/sql_parser.cup
@@ -3145,7 +3145,7 @@ key_value_map ::=
 
 opt_properties ::=
     {:
-    RESULT = null;
+    RESULT = Maps.newHashMap();
     :}
     | properties:properties
     {:
@@ -3155,7 +3155,7 @@ opt_properties ::=
 
 opt_ext_properties ::=
     {:
-    RESULT = null;
+    RESULT = Maps.newHashMap();
     :}
     | KW_BROKER properties:properties
     {: