diff --git a/src/gausskernel/storage/replication/repl_scanner.l b/src/gausskernel/storage/replication/repl_scanner.l
index bcfc125d8..46107a39c 100755
--- a/src/gausskernel/storage/replication/repl_scanner.l
+++ b/src/gausskernel/storage/replication/repl_scanner.l
@@ -202,7 +202,13 @@ WAIT				{ return K_WAIT; }
 				}
 
 .				{
-					return T_WORD;
+					if (u_sess->proc_cxt.clientIsSubscription) {
+						return T_WORD;
+					}
+
+					ereport(ERROR,
+							(errcode(ERRCODE_SYNTAX_ERROR),
+							 errmsg("syntax error: unexpected character \"%s\"", yytext)));
 				}
 %%