Same as #179378: Attempt to assign property of non-object in (error on preview), but on Drupal 6. Maybe you can port the patch used there.

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Ivan Simonov’s picture

Ivan Simonov commented

upload_preview.module

change line 150
from
$node->content['files']['#files'][$fid]->preview = module_invoke_all('upload_preview', $file);

to
if (is_object($node->content['files']['#files'][$fid])) { $node->content['files']['#files'][$fid]->preview = module_invoke_all('upload_preview', $file);}

rmiddle’s picture

rmiddle commented
Status: Active » Reviewed & tested by the community