XenForo Optimize attachments failure

[cdarsch]

I'm getting an error partway through the "optimize attachments" process. Here's the error that appears onscreen


And here's the server error log:
Stack trace
#0 [internal function]: XF::handlePhpError(2, '[E_WARNING] ima...', '/home/gmcrvfor/...', 224)
#1 src/XF/Image/Gd.php(224): imagewebp(Object(GdImage), '/home/gmcrvfor/...', 85)
#2 src/XF/Image/AbstractDriver.php(285): XF\Image\Gd->_optimizeImage('/home/gmcrvfor/...', 85)
#3 src/XF/Service/Attachment/PreparerService.php(183)...

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