Donate button just keep loading

[ciegovolador]

When I press the donate button It's keep loading without any other feedback, on the web or metamask

I have checked the js console log and I get this error

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Error: Error: [number-to-bn] while converting number undefined to BN.js instance, error: invalid number value. Value must be an integer, hex string, BN or BigNumber instance. Note, decimals are not supported. Given value: "undefined"
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I have tried with the following donation values
0.0001
0.0005
0.001
0.0025