diff --git a/components/permissions/permission-rest-resource-impl/src/main/kotlin/net/corda/libs/permissions/endpoints/v1/group/impl/GroupEndpointImpl.kt b/components/permissions/permission-rest-resource-impl/src/main/kotlin/net/corda/libs/permissions/endpoints/v1/group/impl/GroupEndpointImpl.kt
index 9527735f202..3efb5d05b95 100644
--- a/components/permissions/permission-rest-resource-impl/src/main/kotlin/net/corda/libs/permissions/endpoints/v1/group/impl/GroupEndpointImpl.kt
+++ b/components/permissions/permission-rest-resource-impl/src/main/kotlin/net/corda/libs/permissions/endpoints/v1/group/impl/GroupEndpointImpl.kt
@@ -19,6 +19,7 @@ import net.corda.lifecycle.createCoordinator
 import net.corda.permissions.management.PermissionManagementService
 import net.corda.rest.PluggableRestResource
 import net.corda.rest.exception.ExceptionDetails
+import net.corda.rest.exception.InvalidInputDataException
 import net.corda.rest.exception.ResourceNotFoundException
 import net.corda.rest.response.ResponseEntity
 import net.corda.rest.security.CURRENT_REST_CONTEXT
@@ -71,6 +72,14 @@ class GroupEndpointImpl @Activate constructor(
                     e::class.java.simpleName,
                     ExceptionDetails(e::class.java.name, e.message ?: "No resource found for this request.")
                 )
+            } catch (e: IllegalArgumentException) {
+                throw InvalidInputDataException(
+                    title = e::class.java.simpleName,
+                    exceptionDetails = ExceptionDetails(
+                        e::class.java.name,
+                        e.message ?: "Invalid argument in request."
+                    )
+                )
             }
         }