An error occurs as define __resolveType function in resolvers with a certain Moleculer action

[khangca1tex]

When I add an action in __resolveType of a union in resolvers ( example below):

Character: {
__resolveType: {
action: 'character.resolve',
},
Then I executed the query, And got the error: " "Cannot read property 'call' of undefined"
Is there a way to solve the problem ? Thanks everyone

[pabloid64]

I also suffered from this problem. Adding the __typename field by condition solved the problem.