Odoo14 Error: While parsing modifiers for page: for modifier "invisible": fieldValue.indexOf is not a function

 1 Traceback:
 2 Error: While parsing modifiers for page: for modifier "invisible": fieldValue.indexOf is not a function
 3     at Class._registerModifiers (http://localhost:8069/web/content/725-a3953f2/web.assets_backend.js:1673:160)
 4     at http://localhost:8069/web/content/725-a3953f2/web.assets_backend.js:2280:583
 5     at Function._.each._.forEach (http://localhost:8069/web/content/724-6299744/web.assets_common.js:108:558)
 6     at Class._renderTagNotebook (http://localhost:8069/web/content/725-a3953f2/web.assets_backend.js:2280:546)
 7     at Class._renderNode (http://localhost:8069/web/content/725-a3953f2/web.assets_backend.js:2265:244)
 8     at Class._renderNode (http://localhost:8069/web/content/725-a3953f2/web.assets_backend.js:6447:13)
 9     at Class.<anonymous> (http://localhost:8069/web/content/724-6299744/web.assets_common.js:4625:371)
10     at Class._renderNode (http://localhost:8069/web/content/725-a3953f2/web.assets_backend.js:6563:57)
11     at Class._renderNode (http://localhost:8069/web/content/724-6299744/web.assets_common.js:4625:371)
12     at Array.map (<anonymous>)

1 根据字段值来设置attrs中的属性时会出现这种错误。
2 原因有两种：
3 1.比较的时候like或者ilike字段不是字符型。
4 2.字段忘记设置初始值，所以字段默认是None，导致报错。