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Your Greenshiftwoo plugin does not support custom product attributes.
We have our own plugin that adds 2 custom product attributes but the method “init_term_hooks” in the “GSPBWOO_Attribute_Swatches” class grabs every attributes type it finds and thats not good.
error: “call_user_func_array(): Argument #1 ($callback) must be a valid callback, class GSPBWOO_Attribute_Swatches does not have a method “add_grid_field””
We know what the problem is so please constrain only to your own attribute types within your code so your plugin is compatible with other plugins that are adding product attributes