Error:Incorrect integer value: '' for column 'IllNo' at row 1

[slowwalk]

I don't know where to start..

I make a form to submit to mysql..but when I click submit, it said
Error:Incorrect integer value: '' for column 'IllNo' at row 1

Where do I start to check my fault?

Please do help..

[dagon]

show us the code you are using