The Mutakallemim... apply the term non-existence only to absolute non-existence, and not to absence of properties. A property and the absence of that… - Moshe ben Maimon

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The Mutakallemim... apply the term non-existence only to absolute non-existence, and not to absence of properties. A property and the absence of that property are considered by them as two opposites, they treat, e.g., blindness and sight, death and life, in the same way as heat and cold. Therefore they say, without any qualification, non-existence does not require any agent, an agent is required when something is produced.