# Empty submit can add a error POST,how can do?

**URL:** <https://www.ruby-forum.com/t/empty-submit-can-add-a-error-post-how-can-do/61455>\
**Category:** Ruby-Forum\
**Created:** [May 24, 2006, 5:02am UTC](https://www.ruby-forum.com/t/empty-submit-can-add-a-error-post-how-can-do/61455 "2006-05-24T05:02:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![softf5ajivanet](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/9f8e36/32.png) [@softf5ajivanet](https://www.ruby-forum.com/u/softf5ajivanet)\
**Post date:** [May 24, 2006, 5:02am UTC](https://www.ruby-forum.com/t/empty-submit-can-add-a-error-post-how-can-do/61455/1 "2006-05-24T05:02:26Z")

</div>

when I test rforum, i do a /topic/new .  
I have not type anything but submit empty ‘Subject’ and empty ‘Text’.  
Then return information :“Please enter a longer subject” …“Please  
enter a longer text.”.

## now, do /forum/1 then get:

TypeError in Forum#forum  
Showing app/views/forum/forum.rhtml where line #22 raised:

no implicit conversion to float from nil

Extracted source (around line #22):

## 19: 20: \<%=h (topic.post\_counter - 1) %\> 21: 22: \<%=h format\_relative\_time(topic.last\_post\_created\_at) %\> 23: \<%=l :by %\> \<%=h topic.last\_post\_author %\> 24: 25:

I found there has added a topic in datebase  
this topic have null last\_post\_created\_at last\_post\_user\_id  
last\_post\_author .

please help me.How can I do?