When Editing Image Styles and creating an aspect-preserving image resize, you would typically insert only one of width or height in the image resize.
The code in template_preprocess_image_style_preview (line ~68), however, assumes that both width and height have been specified, and tries to divide width by height to get a ratio.
If height has not been specified in the scale setup, a divide by 0 error is thrown.
64: $variables['preview']['derivative']['height'] = round($variables['preview']['derivative']['width'] / $variables['derivative']['width'] * $variables['derivative']['height']);
68: $variables['preview']['derivative']['width'] = round($variables['preview']['derivative']['height'] / $variables['derivative']['height'] * $variables['derivative']['width']);
Fix the code to understand that sizes may not be specified or even available.
Active
11.0 🔥
image system
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Note that the same error occurs when the styles/ directory is not writable, see 🐛 DivisionByZeroError: Division by zero in template_preprocess_image_style_preview() (line 51 of core/modules/image/image.admin.inc). Active