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https://issues.apache.org/struts/browse/WW-2225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43941#action_43941
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Musachy Barroso commented on WW-2225:
-------------------------------------

ValidationAwareSupport doesn't check for null values in addActionError, which 
it should, but changing it now would break backward compatibility. The template 
will print a default empty string if the error is null.

> FieldError tag doesn't check if fieldError variable is null before rendering 
> causing freemarker error
> -----------------------------------------------------------------------------------------------------
>
>                 Key: WW-2225
>                 URL: https://issues.apache.org/struts/browse/WW-2225
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Plugin - Tags
>    Affects Versions: 2.0.11
>            Reporter: Adam Hardy
>            Assignee: tm_jee
>             Fix For: 2.1.3
>
>
> FieldError doesn't check if fieldError is null before rendering causing 
> freemarker error

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