diff --git a/src/parser/openapi3/body.js b/src/parser/openapi3/body.js
index effd3fb..d5da528 100644
--- a/src/parser/openapi3/body.js
+++ b/src/parser/openapi3/body.js
@@ -7,7 +7,8 @@ const _ = require('lodash')
 module.exports = function() {
 
   const MAX_DEPTH_LEVEL = 20;
-
+  let seenSchemas = new WeakSet();
+  
   return function get(verb, path, bodyResponse) {
   	if (!_.isObject(global.definition.paths)) {
       require('../../utils/error.js')('paths is required')
@@ -110,6 +111,17 @@ module.exports = function() {
   }
 
   function replaceAllOfs(schema){
+    if (!_.isObject(schema)) return schema;
+
+   // Detectar ciclos por identidad
+    if (seenSchemas.has(schema)) {
+      return {
+        type: "string",
+        description: "Circular schema avoided"
+      };
+    }
+    seenSchemas.add(schema);
+
     let result = {}
     for (let i in schema) {
       if (i === 'allOf' && _.isArray(schema[i])){
diff --git a/src/parser/swagger2/body.js b/src/parser/swagger2/body.js
index dc5c1ad..a28544d 100644
--- a/src/parser/swagger2/body.js
+++ b/src/parser/swagger2/body.js
@@ -5,6 +5,9 @@
 const _ = require('lodash');
 
 module.exports = function() {
+
+  let seenSchemas = new WeakSet();
+
   
   return function get(verb, path, bodyResponse) {
   	if (!_.isObject(global.definition.paths)) {
@@ -38,6 +41,18 @@ module.exports = function() {
   };
 
   function replaceRefs(schema){
+
+    if (!_.isObject(schema)) return schema;
+
+   // Detectar ciclos por identidad
+    if (seenSchemas.has(schema)) {
+      return {
+        type: "string",
+        description: "Circular schema avoided"
+      };
+    }
+    seenSchemas.add(schema);
+
   	let result = {};
   	for (let i in schema) {
   		if (i === '$ref'){
diff --git a/src/parser/swagger2/pathParameters.js b/src/parser/swagger2/pathParameters.js
index e5c5407..6779acd 100644
--- a/src/parser/swagger2/pathParameters.js
+++ b/src/parser/swagger2/pathParameters.js
@@ -5,6 +5,7 @@
 const _ = require('lodash');
 
 module.exports = function() {
+  let seenSchemas = new WeakSet();
 
 	return function get(verb,path){
 		if (!_.isObject(global.definition.paths)) {
@@ -23,6 +24,17 @@ module.exports = function() {
 	}
 
 	function replaceRefs(schema){
+		if (!_.isObject(schema)) return schema;
+		
+			 // Detectar ciclos por identidad
+				if (seenSchemas.has(schema)) {
+					return {
+						type: "string",
+						description: "Circular schema avoided"
+					};
+				}
+				seenSchemas.add(schema);
+				
 		let result = {};
 		for (let i in schema) {
 			if (i === '$ref'){
diff --git a/src/swagger2json/index.js b/src/swagger2json/index.js
index e33cc2d..5d2e630 100644
--- a/src/swagger2json/index.js
+++ b/src/swagger2json/index.js
@@ -7,13 +7,22 @@ const _ = require('lodash');
 module.exports = function() {
   
   return function get(swagger, name, parent,index){
+if (typeof swagger !== 'object' || swagger === null) {
+    swagger = { type: 'string' };
+  }
 
-    if (!swagger.type && swagger.properties){
-      swagger.type = 'object';
-    } else if (swagger.oneOf) {
-      swagger.type = 'oneOf';
-    } else if (swagger.anyOf) {
-      swagger.type = 'anyOf';
+    if (!swagger.type) {
+      if (swagger.properties) {
+        swagger.type = 'object';
+      } else if (swagger.items) {
+        swagger.type = 'array';
+      } else if (swagger.oneOf) {
+        swagger.type = 'oneOf';
+      } else if (swagger.anyOf) {
+        swagger.type = 'anyOf';
+      } else {
+        swagger.type = 'string';
+      }
     }
 
     let wrongParam = false;