What does the error message "Attempt to read property on null" mean when it is returned by an object inside of a for each loop?

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The error message "Attempt to read property on null" means that the code is trying to access a property of an object that is null or undefined. In the context of a for each loop, it means that one of the objects is null or undefined and the loop is attempting to access a property of that object. This can happen if the loop is not properly checking for null or undefined values before attempting to access their properties.