diff --git a/src/dsql/Parser.cpp b/src/dsql/Parser.cpp
index e9e69082656..7e1b954b059 100644
--- a/src/dsql/Parser.cpp
+++ b/src/dsql/Parser.cpp
@@ -407,6 +407,10 @@ int Parser::yylexAux()
 	}
 
 	SSHORT c = lex.ptr[-1];
+
+	if (c == '\0')
+		yyabandon(yyposn, -104, isc_token_err);
+
 	UCHAR tok_class = classes(c);
 	char string[MAX_TOKEN_LEN];