diff --git a/packages/strapi-database/lib/constants/index.js b/packages/strapi-database/lib/constants/index.js
index 0e0bffa897..68c7f54687 100644
--- a/packages/strapi-database/lib/constants/index.js
+++ b/packages/strapi-database/lib/constants/index.js
@@ -24,8 +24,6 @@ const RESERVED_ATTRIBUTE_NAMES = [
   'attributes',
   'relations',
   'changed',
-  'page',
-  'pageSize',
 
   // list found here https://mongoosejs.com/docs/api.html#schema_Schema.reserved
   '_posts',
diff --git a/packages/strapi-database/lib/queries/paginated-queries.js b/packages/strapi-database/lib/queries/paginated-queries.js
index 34c30d0308..eff74597e9 100644
--- a/packages/strapi-database/lib/queries/paginated-queries.js
+++ b/packages/strapi-database/lib/queries/paginated-queries.js
@@ -35,8 +35,8 @@ const withDefaultPagination = params => {
   const { page = 1, pageSize = 100, ...rest } = params;
 
   return {
-    page: Math.max(1, parseInt(page)) || 1,
-    pageSize: Math.max(1, parseInt(pageSize)) || 100,
+    page: parseInt(page),
+    pageSize: parseInt(pageSize),
     ...rest,
   };
 };
diff --git a/packages/strapi-plugin-content-manager/controllers/collection-types.js b/packages/strapi-plugin-content-manager/controllers/collection-types.js
index 101d112f49..23cab14fe1 100644
--- a/packages/strapi-plugin-content-manager/controllers/collection-types.js
+++ b/packages/strapi-plugin-content-manager/controllers/collection-types.js
@@ -9,7 +9,7 @@ const {
   pickWritableAttributes,
 } = require('../utils');
 const { MANY_RELATIONS } = require('../services/constants');
-const { validateBulkDeleteInput } = require('./validation');
+const { validateBulkDeleteInput, validatePagination } = require('./validation');
 
 module.exports = {
   async find(ctx) {
@@ -232,6 +232,8 @@ module.exports = {
     const { model, id, targetField } = ctx.params;
     const { pageSize = 10, page = 1 } = ctx.request.query;
 
+    validatePagination({ page, pageSize });
+
     const contentTypeService = getService('content-types');
     const entityManager = getService('entity-manager');
     const permissionChecker = getService('permission-checker').create({ userAbility, model });
@@ -276,7 +278,7 @@ module.exports = {
 
     ctx.body = {
       pagination: relationList.pagination,
-      results: relationList.results.map(pick(['id', 'ids', settings.mainField])),
+      results: relationList.results.map(pick(['id', modelDef.primaryKey, settings.mainField])),
     };
   },
 };
diff --git a/packages/strapi-plugin-content-manager/controllers/validation/index.js b/packages/strapi-plugin-content-manager/controllers/validation/index.js
index 5f73c094c6..2f4bae8a1a 100644
--- a/packages/strapi-plugin-content-manager/controllers/validation/index.js
+++ b/packages/strapi-plugin-content-manager/controllers/validation/index.js
@@ -88,6 +88,18 @@ const validateUIDField = (contentTypeUID, field) => {
   }
 };
 
+const validatePagination = ({ page, pageSize }) => {
+  const pageNumber = parseInt(page);
+  const pageSizeNumber = parseInt(pageSize);
+
+  if (isNaN(pageNumber) || pageNumber < 1) {
+    throw strapi.errors.badRequest('invalid pageNumber param');
+  }
+  if (isNaN(pageSizeNumber) || pageSizeNumber < 1) {
+    throw strapi.errors.badRequest('invalid pageSize param');
+  }
+};
+
 module.exports = {
   createModelConfigurationSchema,
   validateKind,
@@ -95,4 +107,5 @@ module.exports = {
   validateGenerateUIDInput,
   validateCheckUIDAvailabilityInput,
   validateUIDField,
+  validatePagination,
 };
diff --git a/packages/strapi-plugin-content-manager/test/api/x-to-many-rf-preview.test.e2e.js b/packages/strapi-plugin-content-manager/test/api/x-to-many-rf-preview.test.e2e.js
index 91eb8f6f53..5050a7a164 100644
--- a/packages/strapi-plugin-content-manager/test/api/x-to-many-rf-preview.test.e2e.js
+++ b/packages/strapi-plugin-content-manager/test/api/x-to-many-rf-preview.test.e2e.js
@@ -5,6 +5,9 @@ const { registerAndLogin } = require('../../../../test/helpers/auth');
 const createModelsUtils = require('../../../../test/helpers/models');
 const { createAuthRequest } = require('../../../../test/helpers/request');
 
+const toIds = arr => uniq(map(prop('id'))(arr));
+const getFrom = model => (start, end) => fixtures[model].map(prop('name')).slice(start, end);
+
 let rq;
 let modelsUtils;
 const data = {
@@ -88,8 +91,6 @@ const fixtures = {
   product: () => {
     const { shop, category } = data;
 
-    const getFrom = model => (start, end) => fixtures[model].map(prop('name')).slice(start, end);
-
     const items = [
       { name: 'PD.A', categories: getFrom('category')(0, 5), shops: getFrom('shop')(0, 12) },
     ];
@@ -176,12 +177,11 @@ describe('x-to-many RF Preview', () => {
   });
 
   describe('Default Behavior', () => {
-    test.each(['shops', 'categories'])('Should returns a preview for the %s field', async field => {
+    test.each(['shops', 'categories'])('Should return a preview for the %s field', async field => {
       const product = data.product[0];
 
       const { body, statusCode } = await rq.get(`${cmProductUrl}/${product.id}/${field}`);
 
-      const toIds = arr => uniq(map(prop('id'))(arr));
       const expected = product[field].slice(0, 10);
 
       expect(statusCode).toBe(200);