diff --git a/src/services/OpenAPIParser.ts b/src/services/OpenAPIParser.ts
index 37a6e138..335461da 100644
--- a/src/services/OpenAPIParser.ts
+++ b/src/services/OpenAPIParser.ts
@@ -63,6 +63,12 @@ export class OpenAPIParser {
     if (spec.openapi === undefined) {
       throw new Error('Document must be valid OpenAPI 3.0.0 definition');
     }
+    if (spec.info === undefined) {
+      throw new Error('OpenAPI 3.0.0 requires an `info` section');
+    }
+    if (spec.info.version === undefined) {
+      console.warn('OpenAPI 3.0.0 requires setting a `info.version` field, ignoring.')
+    }
   }
 
   preprocess(spec: OpenAPISpec) {