diff --git a/lib/utils/SchemaManager.js b/lib/utils/SchemaManager.js
index 7071483b..856a43d7 100644
--- a/lib/utils/SchemaManager.js
+++ b/lib/utils/SchemaManager.js
@@ -71,7 +71,9 @@ export default class SchemaManager {
   getMethodParams(methodPtr, resolveRefs) {
     /* inject JsonPointer into array elements */
     function injectPointers(array, root) {
-      if (!array) return array;
+      if (!Array.isArray(array)) {
+        throw new Error(`parameters must be an array. Got ${typeof array} at ${root}`);
+      }
       return array.map((element, idx) => {
         element._pointer = JsonPointer.join(root, idx);
         return element;