diff --git a/src/core/services/tests/utils/url.test.ts b/src/core/services/tests/utils/url.test.ts
index 50b3fea57..fe3ee07b3 100644
--- a/src/core/services/tests/utils/url.test.ts
+++ b/src/core/services/tests/utils/url.test.ts
@@ -65,6 +65,17 @@ describe('CoreUrlUtilsProvider', () => {
         expect(url).toEqual(originalUrl);
     });
 
+    it('doesn\'t add undefined or null params', () => {
+        const originalUrl = 'https://moodle.org';
+        const url = urlUtils.addParamsToUrl(originalUrl, {
+            foo: undefined,
+            bar: null,
+            baz: 1,
+        });
+
+        expect(url).toEqual('https://moodle.org?baz=1');
+    });
+
     it('adds anchor to URL', () => {
         const originalUrl = 'https://moodle.org';
         const params = {
diff --git a/src/core/services/utils/url.ts b/src/core/services/utils/url.ts
index f0148b84c..eb52e2838 100644
--- a/src/core/services/utils/url.ts
+++ b/src/core/services/utils/url.ts
@@ -64,18 +64,18 @@ export class CoreUrlUtilsProvider {
         const urlAndAnchor = url.split('#');
         url = urlAndAnchor[0];
 
-        let separator = url.indexOf('?') != -1 ? '&' : '?';
+        let separator = url.indexOf('?') !== -1 ? '&' : '?';
 
         for (const key in params) {
             let value = params[key];
 
-            if (boolToNumber && typeof value == 'boolean') {
+            if (boolToNumber && typeof value === 'boolean') {
                 // Convert booleans to 1 or 0.
                 value = value ? '1' : '0';
             }
 
-            // Ignore objects.
-            if (typeof value != 'object') {
+            // Ignore objects and undefined.
+            if (typeof value !== 'object' && value !== undefined) {
                 url += separator + key + '=' + value;
                 separator = '&';
             }