So I inspected the source code and found this enumeration of types that corresponds to RPCArg types: https://github.com/bitcoin/bitcoin/blob/7fcf53f7b4524572d1d0c9a5fdc388e87eb02416/src/rpc/util.h#L119-L130

And "3" stands for "NUM", as they start counting from zero. That explains why your string parameters are not being parsed properly.

So to be clear, you said:


Are you printing these values after the code block you posted? It seems so, because I don't see how get_int64() and get_str() would generate this exception. In that case, on which line does the debugger catches the error?