diff --git a/core/src/main/java/haveno/core/offer/Offer.java b/core/src/main/java/haveno/core/offer/Offer.java
index 3b301869c1..a7cc1845d6 100644
--- a/core/src/main/java/haveno/core/offer/Offer.java
+++ b/core/src/main/java/haveno/core/offer/Offer.java
@@ -81,7 +81,8 @@ public class Offer implements NetworkPayload, PersistablePayload {
         AVAILABLE,
         NOT_AVAILABLE,
         REMOVED,
-        MAKER_OFFLINE
+        MAKER_OFFLINE,
+        INVALID
     }
 
     ///////////////////////////////////////////////////////////////////////////////////////////
diff --git a/core/src/main/java/haveno/core/offer/availability/tasks/ProcessOfferAvailabilityResponse.java b/core/src/main/java/haveno/core/offer/availability/tasks/ProcessOfferAvailabilityResponse.java
index e49235e807..9ffd6ea316 100644
--- a/core/src/main/java/haveno/core/offer/availability/tasks/ProcessOfferAvailabilityResponse.java
+++ b/core/src/main/java/haveno/core/offer/availability/tasks/ProcessOfferAvailabilityResponse.java
@@ -54,7 +54,7 @@ public class ProcessOfferAvailabilityResponse extends Task<OfferAvailabilityMode
             
             // verify maker signature for trade request
             if (!HavenoUtils.isMakerSignatureValid(model.getTradeRequest(), offerAvailabilityResponse.getMakerSignature(), offer.getPubKeyRing())) {
-                offer.setState(Offer.State.UNKNOWN); // TODO: using as invalid state
+                offer.setState(Offer.State.INVALID);
                 failed("Take offer attempt failed because maker signature is invalid");
                 return;
             }
diff --git a/core/src/main/resources/i18n/displayStrings.properties b/core/src/main/resources/i18n/displayStrings.properties
index 9b83175fd3..f631fd8ac8 100644
--- a/core/src/main/resources/i18n/displayStrings.properties
+++ b/core/src/main/resources/i18n/displayStrings.properties
@@ -563,6 +563,7 @@ takeOffer.setAmountPrice=Set amount
 takeOffer.alreadyFunded.askCancel=You have already funded that offer.\nIf you cancel now, your funds will remain in your local Haveno wallet and are available for withdrawal in the \"Funds/Send funds\" screen.\nAre you sure you want to cancel?
 takeOffer.failed.offerNotAvailable=Take offer request failed because the offer is not available anymore. Maybe another trader has taken the offer in the meantime.
 takeOffer.failed.offerTaken=You cannot take that offer because the offer was already taken by another trader.
+takeOffer.failed.offerInvalid=You cannot take that offer because the maker's signature is invalid.
 takeOffer.failed.offerRemoved=You cannot take that offer because the offer has been removed in the meantime.
 takeOffer.failed.offererNotOnline=Take offer request failed because maker is not online anymore.
 takeOffer.failed.offererOffline=You cannot take that offer because the maker is offline.
diff --git a/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferDataModel.java b/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferDataModel.java
index 94e447b5b9..640e467f31 100644
--- a/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferDataModel.java
+++ b/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferDataModel.java
@@ -149,7 +149,9 @@ class TakeOfferDataModel extends OfferDataModel {
                     },
                     errorMessage -> {
                         log.warn(errorMessage);
-                        if (offer.getState() != Offer.State.NOT_AVAILABLE) new Popup().warning(errorMessage).show(); // expected and handled elsewhere in UI
+                        if (offer.getState() != Offer.State.NOT_AVAILABLE && offer.getState() != Offer.State.INVALID) { // handled elsewhere in UI
+                            new Popup().warning(errorMessage).show();
+                        }
                     });
         }
     }
diff --git a/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferViewModel.java b/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferViewModel.java
index 559ad75f74..c6baf04b16 100644
--- a/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferViewModel.java
+++ b/desktop/src/main/java/haveno/desktop/main/offer/takeoffer/TakeOfferViewModel.java
@@ -373,6 +373,10 @@ class TakeOfferViewModel extends ActivatableWithDataModel<TakeOfferDataModel> im
                         offerWarning.set(Res.get("takeOffer.failed.offerTaken"));
                     takeOfferRequested = false;
                     break;
+                case INVALID:
+                    offerWarning.set(Res.get("takeOffer.failed.offerInvalid"));
+                    takeOfferRequested = false;
+                    break;
                 case REMOVED:
                     // if (takeOfferRequested) // TODO: show any warning or removed is expected?
                     //     offerWarning.set(Res.get("takeOffer.failed.offerRemoved"));
diff --git a/proto/src/main/proto/pb.proto b/proto/src/main/proto/pb.proto
index e42ae85658..1eb6b3bd80 100644
--- a/proto/src/main/proto/pb.proto
+++ b/proto/src/main/proto/pb.proto
@@ -1358,6 +1358,7 @@ message Offer {
         NOT_AVAILABLE = 4;
         REMOVED = 5;
         MAKER_OFFLINE = 6;
+        INVALID = 7;
     }
 
     OfferPayload offer_payload = 1;