php - Laravel eloquent how to get the minimum value that is not NULL? -

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this code in product model minimum price value (one product can have multiple price)

public function getlowestattribute () {     return $this->prices->min('price'); }

but return null rather smallest integer if there null.

basically want achieve this:

[1, null, 2] returns 1

[1, null, 0] returns 0

any suggestion appreciated.

have tried maybe 

public function getlowestattribute () {     return $this->prices->where('price','>=',0)->min('price'); }

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