MySQL: detecting a text "NULL" or 0 field and changing it to proper NULL -

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i have following bit of code

update  table_one  set  field_one = case      when field_one = 'null' or field_one = 0     null     else field_one   end

so want see if field has string "null" or 0 (0) value. if should set null within database.

the issue i'm having it's setting null in fields while other fields okay.

is there wrong code?

update table_one set    field_one = null  field_one = 'null' or     field_one = '0'

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