diff --git a/e2e/verifiable-credentials.service.e2e.ts b/e2e/verifiable-credentials.service.e2e.ts
index 5df633bc..2ea95bee 100644
--- a/e2e/verifiable-credentials.service.e2e.ts
+++ b/e2e/verifiable-credentials.service.e2e.ts
@@ -11,13 +11,15 @@ import {
   claimsBySubject,
 } from './fixtures';
 import { replenish, rpcUrl, setupENS } from './utils/setup-contracts';
-import { CacheClient, fromPrivateKey } from '../src';
 import {
+  CacheClient,
+  fromPrivateKey,
+  InterfaceNotSatisfied,
   getVerifiableCredentialsService,
   IssuerFields,
   RoleCredentialSubject,
   VerifiableCredentialsServiceBase,
-} from '../src/modules/verifiable-credentials';
+} from '../src/';
 import {
   VC_API_EXCHANGE,
   VerifiableCredential,
@@ -157,6 +159,12 @@ describe('Verifiable credentials tests', () => {
       expect(result).toBe(true);
     });
 
+    test('should not create VC with invalid issuer fields', async () => {
+      return expect(
+        createExampleSignedCredential([{ key: 'foo' } as IssuerFields])
+      ).rejects.toBeInstanceOf(InterfaceNotSatisfied);
+    });
+
     test('should throw an error for invalid VC during verification', async () => {
       const vc = await createExampleSignedCredential([]);
 
diff --git a/src/errors/index.ts b/src/errors/index.ts
index d317bea6..da1ca949 100644
--- a/src/errors/index.ts
+++ b/src/errors/index.ts
@@ -7,3 +7,4 @@ export { ERROR_MESSAGES } from './error-messages';
 export { MalformedDIDError } from './malformed-did.error';
 export { NotAuthorizedIssuer } from './not-authorized-issuer';
 export { AssetNotExist } from './asset-not-exist';
+export { InterfaceNotSatisfied } from './interface-not-satisfied';
diff --git a/src/errors/interface-not-satisfied.ts b/src/errors/interface-not-satisfied.ts
new file mode 100644
index 00000000..369f8cd3
--- /dev/null
+++ b/src/errors/interface-not-satisfied.ts
@@ -0,0 +1,5 @@
+export class InterfaceNotSatisfied extends Error {
+  constructor(interf: string, reason: string) {
+    super(`Interface ${interf} is not satisfied: ${reason}`);
+  }
+}
diff --git a/src/modules/claims/claims.types.ts b/src/modules/claims/claims.types.ts
index add1130f..16d9ae77 100644
--- a/src/modules/claims/claims.types.ts
+++ b/src/modules/claims/claims.types.ts
@@ -10,6 +10,7 @@ import {
   IOrganizationDefinition,
   IRoleDefinition,
   IRoleDefinitionV2,
+  IssuerFields,
 } from '@energyweb/credential-governance';
 
 export interface IClaimRequest extends IMessage {
@@ -192,7 +193,7 @@ export interface IssueClaimRequestOptions {
   registrationTypes: RegistrationTypes[];
 
   /** Issuer fields that role is requiring */
-  issuerFields?: { key: string; value: string | number }[];
+  issuerFields?: IssuerFields[];
 
   /** Indicates whether to publish role on-chain or not (default: false) */
   publishOnChain?: boolean;
@@ -265,7 +266,7 @@ export interface IssueClaimOptions {
     claimTypeVersion: number;
 
     /** Issuers fields that role is requiring */
-    issuerFields?: { key: string; value: string | number }[];
+    issuerFields?: IssuerFields[];
   };
 
   /*
@@ -334,7 +335,7 @@ export interface IssueVerifiablePresentationOptions {
   version: string;
 
   /** Issuers fields that role is requiring */
-  issuerFields?: { key: string; value: string | number }[];
+  issuerFields?: IssuerFields[];
 
   /*
    * Indicates credential status (such as revocation status)
diff --git a/src/modules/verifiable-credentials/types/verifiable-credentials.types.ts b/src/modules/verifiable-credentials/types/verifiable-credentials.types.ts
index c5529ec3..d519154f 100644
--- a/src/modules/verifiable-credentials/types/verifiable-credentials.types.ts
+++ b/src/modules/verifiable-credentials/types/verifiable-credentials.types.ts
@@ -1,6 +1,7 @@
+import { IssuerFields } from '@energyweb/credential-governance';
 import { StatusList2021Entry } from '@ew-did-registry/credentials-interface';
 import { IPresentationDefinition, SelectResults } from '@sphereon/pex';
-import { IssuerFields } from './role-credential.types';
+import { InterfaceNotSatisfied } from '../../../errors/interface-not-satisfied';
 
 /*
  * Parameters required to construct the subject for a role credential
@@ -28,6 +29,19 @@ export interface RoleCredentialSubjectParams {
   /** Indicates if credential is actual of time of verification */
   credentialStatus?: StatusList2021Entry;
 }
+export const validateRoleCredentialSubject = (
+  subject: RoleCredentialSubjectParams
+) => {
+  const invalidField = subject.issuerFields?.find(
+    (field) => !['string', 'number'].includes(typeof field.value)
+  );
+  if (invalidField) {
+    throw new InterfaceNotSatisfied(
+      'RoleCredentialSubjectParam',
+      `IssuerFields invalid: ${invalidField.key} is not string or number`
+    );
+  }
+};
 
 export interface ProofOptions {
   /* Proof verification method */
diff --git a/src/modules/verifiable-credentials/verifiable-credentials-base.service.ts b/src/modules/verifiable-credentials/verifiable-credentials-base.service.ts
index 9139dc28..19f0e7cd 100644
--- a/src/modules/verifiable-credentials/verifiable-credentials-base.service.ts
+++ b/src/modules/verifiable-credentials/verifiable-credentials-base.service.ts
@@ -33,6 +33,7 @@ import {
   StatusList2021Credential,
   statusList2021CredentialEIP712Types,
   CredentialRevocationDetailsResult,
+  validateRoleCredentialSubject,
 } from './types';
 import { ERROR_MESSAGES } from '../../errors';
 import { CacheClient } from '../cache-client';
@@ -556,6 +557,7 @@ export abstract class VerifiableCredentialsServiceBase {
   public createCredential(
     params: RoleCredentialSubjectParams
   ): Credential<RoleCredentialSubject> {
+    validateRoleCredentialSubject(params);
     const credential: Credential<RoleCredentialSubject> = {
       // TODO: Host EWF VC Context and Vocabulary
       '@context': ['https://www.w3.org/2018/credentials/v1'],