Index: binaries/data/mods/public/gui/session/menu.js
===================================================================
--- binaries/data/mods/public/gui/session/menu.js
+++ binaries/data/mods/public/gui/session/menu.js
@@ -855,7 +855,10 @@
 		});
 	};
 
-	barterButton.Buy.hidden = isSelected;
+	// Cannot sell non-currency for non-currency
+	let currencyCodes = g_ResourceData.GetCodes("currency");
+	barterButton.Buy.hidden = isSelected || !currencyCodes.some(x => x == g_BarterSell || x == resourceCode);
+
 	barterButton.Buy.enabled = controlsPlayer(player);
 	barterButton.Sell.hidden = false;
 	selectionIcon.hidden = !isSelected;
Index: binaries/data/mods/public/simulation/ai/petra/tradeManager.js
===================================================================
--- binaries/data/mods/public/simulation/ai/petra/tradeManager.js
+++ binaries/data/mods/public/simulation/ai/petra/tradeManager.js
@@ -247,6 +247,10 @@
 			if (needs[sell] > 0 || available[sell] < 500)
 				continue;
 
+			// Do not sell non-currency for non-currency
+			if (!GetCodes("currency").some(x => x == sell || x == buy))
+				continue;
+
 			let barterRateMin;
 			if (sell == "food")
 			{