diff --git a/codex/contracts/market.nim b/codex/contracts/market.nim
index f415711d..52800b7e 100644
--- a/codex/contracts/market.nim
+++ b/codex/contracts/market.nim
@@ -366,7 +366,12 @@ method submitProof*(
     market: OnChainMarket, id: SlotId, proof: Groth16Proof
 ) {.async: (raises: [CancelledError, MarketError]).} =
   convertEthersError("Failed to submit proof"):
-    discard await market.contract.submitProof(id, proof).confirm(1)
+    try:
+      discard await market.contract.submitProof(id, proof).confirm(1)
+    except Proofs_InvalidProof as parent:
+      raise newException(
+        ProofInvalidError, "Failed to submit proof because the proof is invalid", parent
+      )
 
 method markProofAsMissing*(
     market: OnChainMarket, id: SlotId, period: Period
diff --git a/codex/market.nim b/codex/market.nim
index 0303a906..0fe69347 100644
--- a/codex/market.nim
+++ b/codex/market.nim
@@ -20,6 +20,7 @@ type
   MarketError* = object of CodexError
   SlotStateMismatchError* = object of MarketError
   SlotReservationNotAllowedError* = object of MarketError
+  ProofInvalidError* = object of MarketError
   Subscription* = ref object of RootObj
   OnRequest* =
     proc(id: RequestId, ask: StorageAsk, expiry: uint64) {.gcsafe, upraises: [].}
diff --git a/codex/sales/states/provingsimulated.nim b/codex/sales/states/provingsimulated.nim
index b8a3e9ce..edf7eb1e 100644
--- a/codex/sales/states/provingsimulated.nim
+++ b/codex/sales/states/provingsimulated.nim
@@ -40,7 +40,7 @@ when codex_enable_proof_failures:
         try:
           warn "Submitting INVALID proof", period = currentPeriod, slotId = slot.id
           await market.submitProof(slot.id, Groth16Proof.default)
-        except Proofs_InvalidProof as e:
+        except ProofInvalidError as e:
           discard # expected
         except CancelledError as error:
           raise error