diff --git a/package.json b/package.json
index 47e78d01..f215ef17 100644
--- a/package.json
+++ b/package.json
@@ -86,6 +86,7 @@
   },
   "dependencies": {
     "aspida": "^0.22.2",
+    "openapi-types": "^7.0.1",
     "swagger-parser": "^10.0.2",
     "swagger2openapi": "^7.0.3"
   },
diff --git a/src/builderUtils/converters.ts b/src/builderUtils/converters.ts
index a7f60080..16732686 100644
--- a/src/builderUtils/converters.ts
+++ b/src/builderUtils/converters.ts
@@ -121,7 +121,7 @@ export const schema2value = (
       null: 'null',
       string: 'string',
       boolean: 'boolean'
-    }[schema.type]
+    }[schema.type ?? 'string']
   }
 
   return value ? { isArray, isEnum, isOneOf, value } : null
diff --git a/yarn.lock b/yarn.lock
index 98f2b5a5..8d75226f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4232,6 +4232,11 @@ onetime@^5.1.0:
   dependencies:
     mimic-fn "^2.1.0"
 
+openapi-types@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/openapi-types/-/openapi-types-7.0.1.tgz#966bcacfd14119fa12000dbc9d588bfd8df2e4d1"
+  integrity sha512-6pi4/Fw+JIW1HHda2Ij7LRJ5QJ8f6YzaXnsRA6m44BJz8nLq/j5gVFzPBKJo+uOFhAeHqZC/3uzhTpYPga3Q/A==
+
 optionator@^0.8.1:
   version "0.8.3"
   resolved "https://registry.yarnpkg.com/optionator/-/optionator-0.8.3.tgz#84fa1d036fe9d3c7e21d99884b601167ec8fb495"