Implode error on nodes with no image associated with them.

Getting an implode error when using with Goofy, and phptemplate based themes.

example;
implode(): Bad arguments. in /home/yadda/public_html/themes/goofy/goofy.theme on line 151.
Line 151 is;
$subright = implode(' ', $images)."
".$subright;

Images display and everything appears to function, however it throws an error whenever someone hits a node that doesnt have an image associated with it.