diff --git a/yarn-project/acir-simulator/src/client/simulator.ts b/yarn-project/acir-simulator/src/client/simulator.ts
index d5e6567e2a9..d9ec7b44799 100644
--- a/yarn-project/acir-simulator/src/client/simulator.ts
+++ b/yarn-project/acir-simulator/src/client/simulator.ts
@@ -168,37 +168,38 @@ export class AcirSimulator {
     storageSlot: Fr,
     notePreimage: Fr[],
   ) {
+    let abi: FunctionAbiWithDebugMetadata;
     try {
-      const abi = await this.db.getFunctionABI(contractAddress, computeNoteHashAndNullifierSelector);
-
-      const preimageLen = (abi.parameters[3].type as ArrayType).length;
-      const extendedPreimage = notePreimage.concat(Array(preimageLen - notePreimage.length).fill(Fr.ZERO));
-
-      const execRequest: FunctionCall = {
-        to: AztecAddress.ZERO,
-        functionData: FunctionData.empty(),
-        args: encodeArguments(abi, [contractAddress, nonce, storageSlot, extendedPreimage]),
-      };
-
-      const [innerNoteHash, siloedNoteHash, uniqueSiloedNoteHash, innerNullifier] = (await this.runUnconstrained(
-        execRequest,
-        AztecAddress.ZERO,
-        abi,
-        AztecAddress.ZERO,
-        EthAddress.ZERO,
-      )) as bigint[];
-
-      return {
-        innerNoteHash: new Fr(innerNoteHash),
-        siloedNoteHash: new Fr(siloedNoteHash),
-        uniqueSiloedNoteHash: new Fr(uniqueSiloedNoteHash),
-        innerNullifier: new Fr(innerNullifier),
-      };
+      abi = await this.db.getFunctionABI(contractAddress, computeNoteHashAndNullifierSelector);
     } catch (e) {
       throw new Error(
         `Mandatory implementation of "${computeNoteHashAndNullifierSignature}" missing in noir contract ${contractAddress.toString()}.`,
       );
     }
+
+    const preimageLen = (abi.parameters[3].type as ArrayType).length;
+    const extendedPreimage = notePreimage.concat(Array(preimageLen - notePreimage.length).fill(Fr.ZERO));
+
+    const execRequest: FunctionCall = {
+      to: AztecAddress.ZERO,
+      functionData: FunctionData.empty(),
+      args: encodeArguments(abi, [contractAddress, nonce, storageSlot, extendedPreimage]),
+    };
+
+    const [innerNoteHash, siloedNoteHash, uniqueSiloedNoteHash, innerNullifier] = (await this.runUnconstrained(
+      execRequest,
+      AztecAddress.ZERO,
+      abi,
+      AztecAddress.ZERO,
+      EthAddress.ZERO,
+    )) as bigint[];
+
+    return {
+      innerNoteHash: new Fr(innerNoteHash),
+      siloedNoteHash: new Fr(siloedNoteHash),
+      uniqueSiloedNoteHash: new Fr(uniqueSiloedNoteHash),
+      innerNullifier: new Fr(innerNullifier),
+    };
   }
 
   /**