Freeciv

dai_goldequiv_clause() checks, in case of ceasefire -clause, if dai_players_can_agree_on_ceasefire(). The return value handling makes no sense. It's almost the opposite to what it should be (just missing 'not' (!)), but not exactly.
If players cannot agree on ceasefire, the execution continues to normal ceasefire value calculation. If players can agree on ceasefire, value of the ceasefire is set to 0.
Likely it should set value of the ceasefire to a negative value (callers consider that as sign to not continue with the ceasefire, no matter total value of the treaty) in case players cannot accept ceasefire, and use "normal" calculation when they can.