diff --git a/src/ls_odbc.c b/src/ls_odbc.c
index 8e38d1a..d61504b 100644
--- a/src/ls_odbc.c
+++ b/src/ls_odbc.c
@@ -292,15 +292,6 @@ static int cur_shut(lua_State *L, cur_data *cur)
 */
 static const char *sqltypetolua (const SQLSMALLINT type) {
     switch (type) {
-        case SQL_UNKNOWN_TYPE: case SQL_CHAR: case SQL_VARCHAR: 
-        case SQL_TYPE_DATE: case SQL_TYPE_TIME: case SQL_TYPE_TIMESTAMP: 
-        case SQL_DATE: case SQL_INTERVAL: case SQL_TIMESTAMP: 
-        case SQL_LONGVARCHAR:
-        case SQL_WCHAR: case SQL_WVARCHAR: case SQL_WLONGVARCHAR:
-#if (ODBCVER >= 0x0350)
-		case SQL_GUID:
-#endif
-            return "string";
         case SQL_BIGINT: case SQL_TINYINT: 
         case SQL_INTEGER: case SQL_SMALLINT: 
 #if LUA_VERSION_NUM>=503
@@ -314,8 +305,7 @@ static const char *sqltypetolua (const SQLSMALLINT type) {
         case SQL_BIT:
             return "boolean";
         default:
-            assert(0);
-            return NULL;
+            return "string";
     }
 }