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First time we see this: client tried to upload a specific PNG file (that a first sight looks ok) and Craft CMS returned the error 'png_compression_level should be an integer from 0 to 9'

Error message

Tim Bertens
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1 Answers1

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This turned out to be a bug and the fix will be in the next release (current version is 3.5.15.1).

Oli
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