diff --git a/README.md b/README.md
index 1c1467f..b647d90 100644
--- a/README.md
+++ b/README.md
@@ -310,6 +310,16 @@ To see all the types you can choose from, run `strapi content-types:list`.
 
 > `required:` NO | `type:` array
 
+### Exclude invalid relations relational objects
+This setting allow you to exclude invalid entries when the pattern is not valid for the entry
+
+Example : You have added a `slug` property to the configuration entry `allowedFields`.
+If a content doesn't have the field `slug` filled, no entry in the sitemap will be generated for this content (to avoid duplicate content)
+
+###### Key: `discardInvalidRelations `
+
+> `required:` NO | `type:` boolean
+
 ## 🤝 Contributing
 
 Feel free to fork and make a pull request of this plugin. All the input is welcome!
diff --git a/server/config.js b/server/config.js
index 8ac019b..07c6445 100644
--- a/server/config.js
+++ b/server/config.js
@@ -8,6 +8,7 @@ module.exports = {
     autoGenerate: false,
     caching: true,
     allowedFields: ['id', 'uid'],
+    discardInvalidRelations: false,
     excludedTypes: [
       'admin::permission',
       'admin::role',
diff --git a/server/services/__tests__/pattern.test.js b/server/services/__tests__/pattern.test.js
index e277e06..f051372 100644
--- a/server/services/__tests__/pattern.test.js
+++ b/server/services/__tests__/pattern.test.js
@@ -3,6 +3,18 @@
 
 const patternService = require('../pattern');
 
+const get = function baseGet(object, path) {
+  let index = 0;
+  path = path.split('.');
+  const length = path.length;
+
+  while (object != null && index < length) {
+    const newKey = path[index++];
+    object = object[newKey];
+  }
+  return (index && index === length) ? object : undefined;
+};
+
 global.strapi = {
   contentTypes: {
     'another-test-relation:target:api': {
@@ -28,6 +40,14 @@ global.strapi = {
       },
     },
   },
+  config: {
+    plugin: {
+      sitemap: {
+        discardInvalidRelations: false
+      }
+    },
+    get: ((key) => get(global.strapi.config, key)),
+  }
 };
 
 describe('Pattern service', () => {
@@ -151,6 +171,22 @@ describe('Pattern service', () => {
 
       expect(result).toMatch('/en/my-page-slug');
     });
+
+    test('Resolve pattern with missing relation', async () => {
+      const pattern = '/en/[slug]';
+      const entity = {
+        title: "my-page-title",
+      };
+
+      global.strapi.config.plugin.sitemap.discardInvalidRelations = true;
+
+      const result = await patternService().resolvePattern(pattern, entity);
+
+      expect(result).toBe(null);
+
+      // Restore 
+      global.strapi.config.plugin.sitemap.discardInvalidRelations = false;
+    });
   });
   describe('Validate pattern', () => {
     test('Should return { valid: true } for a valid pattern', async () => {
diff --git a/server/services/core.js b/server/services/core.js
index 7e8450b..b3e5565 100644
--- a/server/services/core.js
+++ b/server/services/core.js
@@ -67,6 +67,7 @@ const getLanguageLinks = async (config, page, contentType, defaultURL) => {
 
     const { pattern } = config.contentTypes[contentType]['languages'][locale];
     const translationUrl = await strapi.plugins.sitemap.services.pattern.resolvePattern(pattern, translation);
+    if (!translationUrl) return null;
     let hostnameOverride = config.hostname_overrides[translation.locale] || '';
     hostnameOverride = hostnameOverride.replace(/\/+$/, '');
     links.push({
@@ -112,6 +113,7 @@ const getSitemapPageData = async (config, page, contentType) => {
 
   const { pattern } = config.contentTypes[contentType]['languages'][locale];
   const path = await strapi.plugins.sitemap.services.pattern.resolvePattern(pattern, page);
+  if (!path) return null;
   let hostnameOverride = config.hostname_overrides[page.locale] || '';
   hostnameOverride = hostnameOverride.replace(/\/+$/, '');
   const url = `${hostnameOverride}${path}`;
diff --git a/server/services/pattern.js b/server/services/pattern.js
index bf658b0..58aa427 100644
--- a/server/services/pattern.js
+++ b/server/services/pattern.js
@@ -124,19 +124,33 @@ const getRelationsFromPattern = (pattern) => {
 
 const resolvePattern = async (pattern, entity) => {
   const fields = getFieldsFromPattern(pattern);
+  let errorInPattern = false;
 
   fields.map((field) => {
     const relationalField = field.split('.').length > 1 ? field.split('.') : null;
 
     if (!relationalField) {
-      pattern = pattern.replace(`[${field}]`, entity[field] || '');
+      const replacement = entity[field] || '';
+      if (strapi.config.get('plugin.sitemap.discardInvalidRelations') && !replacement) {
+        errorInPattern = true;
+        return;
+      }
+      pattern = pattern.replace(`[${field}]`, replacement);
     } else if (Array.isArray(entity[relationalField[0]])) {
       strapi.log.error(logMessage('Something went wrong whilst resolving the pattern.'));
     } else if (typeof entity[relationalField[0]] === 'object') {
-      pattern = pattern.replace(`[${field}]`, entity[relationalField[0]] && entity[relationalField[0]][relationalField[1]] ? entity[relationalField[0]][relationalField[1]] : '');
+      const replacement = entity[relationalField[0]] && entity[relationalField[0]][relationalField[1]] ? entity[relationalField[0]][relationalField[1]] : '';
+      if (strapi.config.get('plugin.sitemap.discardInvalidRelations') && !replacement) {
+        errorInPattern = true;
+        return;
+      }
+
+      pattern = pattern.replace(`[${field}]`, replacement);
     }
   });
 
+  if (errorInPattern) return null; // Return null if there was an error in the pattern due to invalid relation and avoid duplicate content
+
   pattern = pattern.replace(/\/+/g, '/'); // Remove duplicate forward slashes.
   pattern = pattern.startsWith('/') ? pattern : `/${pattern}`; // Make sure we only have on forward slash.
   return pattern;