The constructor of GivingThanks accepts address of the registry but uses msg.sender to instantiate it.
The instance of the CharityRegistryshould be initialized with the address of a registry contract. However, it is initialized with msg.sender in the constructor of GivingThanks.
This way, the registry instance is not created properly.
Manual
Initialize the registrywith the right address.
Likelyhood: High, the parameter is not well used and won't be set. Impact: Low, can be changed with the setter and no one will be able to donate to malicious charity.
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