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Here is the short definition about fallback function in solidity:

Solidity fallback function does not have any arguments, has external visibility and does not return anything.

What happens if there is no fallback function and someone calls non-existing function in the smart contract? Is there security complication without a fallback function?

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The call will simple fail and revert. There are no security implications as everything will be reverted.

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  • May the contract not collect some ether associated with the call?
    – user938363
    Jan 16 at 7:36
  • No. The whole transaction reverts. All possible Ethers are returned. Jan 16 at 15:11

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