diff --git a/src/popup/views/addToken.js b/src/popup/views/addToken.js
index 5ae5390..793a6d6 100644
--- a/src/popup/views/addToken.js
+++ b/src/popup/views/addToken.js
@@ -17,6 +17,11 @@ const { log } = require("../../shared/log");
 // AddToken was last opened changes neither the screen nor the status line.
 let addTokenScreenOpenings = 0;
 
+function findTracked(address) {
+    const lower = address.toLowerCase();
+    return state.trackedTokens.find((t) => t.address.toLowerCase() === lower);
+}
+
 function show() {
     addTokenScreenOpenings++;
     $("add-token-address").value = "";
@@ -50,9 +55,7 @@ function init(ctx) {
             showFlash("Enter a valid contract address starting with 0x.");
             return;
         }
-        const already = state.trackedTokens.find(
-            (t) => t.address.toLowerCase() === contractAddr.toLowerCase(),
-        );
+        const already = findTracked(contractAddr);
         if (already) {
             showFlash(already.symbol + " is already being tracked.");
             return;
@@ -85,6 +88,18 @@ function init(ctx) {
                 );
                 return;
             }
+            // Another click on Add may have tracked this token while this
+            // lookup waited.
+            const trackedMeanwhile = findTracked(contractAddr);
+            if (trackedMeanwhile) {
+                showFlash(
+                    trackedMeanwhile.symbol + " is already being tracked.",
+                );
+                if (addTokenScreenOpenings !== opening) return;
+                infoEl.textContent = "";
+                infoEl.style.visibility = "hidden";
+                return;
+            }
             // The balance list never shows a token that the spoof rule
             // refuses, so such a token is not tracked.
             if (isSpoofedSymbol(info.symbol, contractAddr, chainId)) {
diff --git a/src/popup/views/settingsAddToken.js b/src/popup/views/settingsAddToken.js
index 1c4aa9f..6a67947 100644
--- a/src/popup/views/settingsAddToken.js
+++ b/src/popup/views/settingsAddToken.js
@@ -163,6 +163,14 @@ function init(_ctx) {
                 );
                 return;
             }
+            // Another click on Add, or a "Top tokens:" button, may have
+            // tracked this token while this lookup waited.
+            if (isTracked(addr)) {
+                showFlash("Already tracked.");
+                infoEl.textContent = "";
+                infoEl.style.visibility = "hidden";
+                return;
+            }
             // The balance list never shows a token that the spoof rule
             // refuses, so such a token is not tracked. The rule never refuses
             // a bundled token, so the "Top tokens:" buttons and the top 100
diff --git a/tests/addTokenLateAnswer.test.js b/tests/addTokenLateAnswer.test.js
index 84ae220..b8123a6 100644
--- a/tests/addTokenLateAnswer.test.js
+++ b/tests/addTokenLateAnswer.test.js
@@ -1,8 +1,10 @@
 // A contract lookup on AddToken can answer after the user has left AddToken.
 // The token is still added, and the screen the user is on does not change
 // (https://git.eeqj.de/sneak/AutistMask/issues/603). An answer while AddToken
-// still shows goes to AddressDetail. Driven through the real popup over a
-// stored profile.
+// still shows goes to AddressDetail. On either add-token screen, an answer for a
+// token tracked while the lookup waited tracks nothing
+// (https://git.eeqj.de/sneak/AutistMask/issues/727). Driven through the real
+// popup over a stored profile.
 
 const {
     bootPopup,
@@ -43,9 +45,9 @@ async function openAddToken() {
     return boot;
 }
 
-// Presses Add with a contract lookup that answers only when the function
-// returned here is called. That function waits for Add to finish.
-function addWithPendingLookup(boot) {
+// Presses `button` with a contract lookup that answers only when the function
+// returned here is called. That function waits for the add to finish.
+function addWithPendingLookup(boot, button = "btn-add-token-confirm") {
     const { lookupTokenInfo } = require("../src/shared/balances");
     let answer;
     lookupTokenInfo.mockImplementationOnce(
@@ -54,7 +56,7 @@ function addWithPendingLookup(boot) {
                 answer = resolve;
             }),
     );
-    const adding = boot.click("btn-add-token-confirm");
+    const adding = boot.click(button);
     return async () => {
         answer({
             symbol: TOKEN.symbol,
@@ -136,3 +138,78 @@ test("an answer while AddToken still shows goes to AddressDetail with the token
     expect(boot.node("address-balances").innerHTML).toContain("TST");
     expect(boot.storage.read("autistmask").trackedTokens).toEqual([TOKEN]);
 });
+
+test("an answer for a token tracked after AddToken was opened again leaves the status line as it is", async () => {
+    const boot = await openAddToken();
+    const answerFirstLookup = addWithPendingLookup(boot);
+    await boot.click("btn-add-token-back");
+    await boot.click("btn-add-token");
+    boot.node("add-token-address").value = OTHER_TOKEN_ADDRESS;
+    // The second lookup is never answered.
+    addWithPendingLookup(boot);
+    require("../src/popup/views/helpers").trackToken(TOKEN);
+
+    await answerFirstLookup();
+    expect(boot.text("flash-msg")).toBe("TST is already being tracked.");
+    expect(boot.text("add-token-info")).toBe("Looking up token...");
+});
+
+// Each screen is opened from AddressDetail by the buttons named, in order.
+describe.each([
+    [
+        "AddToken",
+        ["btn-add-token"],
+        "add-token-address",
+        "btn-add-token-confirm",
+        "add-token-info",
+        "TST is already being tracked.",
+    ],
+    [
+        "SettingsAddToken",
+        ["btn-settings", "btn-settings-add-token"],
+        "settings-addtoken-address",
+        "btn-settings-addtoken-manual",
+        "settings-addtoken-info",
+        "Already tracked.",
+    ],
+])("%s", (_, opening, field, button, statusLine, alreadyTrackedFlash) => {
+    // The screen open with TOKEN's contract address typed in.
+    async function openScreen() {
+        const boot = await bootPopup(
+            unversionedValidProfile({
+                currentView: "address",
+                selectedWallet: 0,
+                selectedAddress: 0,
+            }),
+        );
+        expect(boot.pageErrors).toEqual([]);
+        for (const id of opening) await boot.click(id);
+        boot.node(field).value = TOKEN.address;
+        return boot;
+    }
+
+    test("a second click on Add while the lookup waits tracks the token once", async () => {
+        const boot = await openScreen();
+        const answerFirstClick = addWithPendingLookup(boot, button);
+        const answerSecondClick = addWithPendingLookup(boot, button);
+
+        await answerFirstClick();
+        await answerSecondClick();
+        expect(boot.text("flash-msg")).toBe(alreadyTrackedFlash);
+        expect(boot.storage.read("autistmask").trackedTokens).toEqual([TOKEN]);
+    });
+
+    test("an answer for a token tracked while the lookup waited clears the status line", async () => {
+        const boot = await openScreen();
+        const answerLookup = addWithPendingLookup(boot, button);
+        expect(boot.text(statusLine)).toBe("Looking up token...");
+        require("../src/popup/views/helpers").trackToken(TOKEN);
+
+        await answerLookup();
+        expect(boot.text("flash-msg")).toBe(alreadyTrackedFlash);
+        expect(boot.text(statusLine)).toBe("");
+        expect(boot.node(statusLine).style.visibility).toBe("hidden");
+        const { state } = require("../src/shared/state");
+        expect(state.trackedTokens).toEqual([TOKEN]);
+    });
+});