Database error, duplicate entry

i have only one rule and tried to edit it. seems to be a bug

user warning: Duplicate entry '0' for key 'rid' query: INSERT INTO render (plugin, name, selector, weight, properties) VALUES ('sifr', 'H1 teaser', '#teaseme h1', 0, 'a:14:{s:4:\"font\";s:54:\"sites/default/files/render/franklingothic_bold_cs4.swf\";s:5:\"color\";s:7:\"#ffffff\";s:9:\"linkcolor\";s:7:\"#ffffff\";s:7:\"bgcolor\";s:7:\"#00198A\";s:11:\"transparent\";s:1:\"1\";s:13:\"letterspacing\";s:0:\"\";s:8:\"fontsize\";s:5:\"1.8em\";s:10:\"paddingtop\";s:0:\"\";s:12:\"paddingright\";s:0:\"\";s:13:\"paddingbottom\";s:0:\"\";s:11:\"paddingleft\";s:0:\"\";s:9:\"textalign\";s:4:\"left\";s:10:\"lettercase\";s:6:\"normal\";s:9:\"underline\";i:0;}') in C:\xampp\htdocs\k-ue\sites\all\modules\render\render.module on line 760.