diff --git a/lib/modules/analytics/index.js b/lib/modules/analytics/index.js
index 3cba2d47..39ad9bc9 100644
--- a/lib/modules/analytics/index.js
+++ b/lib/modules/analytics/index.js
@@ -122,7 +122,12 @@ export default class Analytics extends ModuleBase {
    * Sets the user ID property.
    * @param id
    */
-  setUserId(id: string): void {
+  setUserId(id: string | null): void {
+    if (id !== null && !isString(id)) {
+      throw new Error(
+        'analytics.setUserId(): The supplied userId must be a string value or null.'
+      );
+    }
     getNativeModule(this).setUserId(id);
   }
 
@@ -131,17 +136,28 @@ export default class Analytics extends ModuleBase {
    * @param name
    * @param value
    */
-  setUserProperty(name: string, value: string): void {
+  setUserProperty(name: string, value: string | null): void {
+    if (value !== null && !isString(value)) {
+      throw new Error(
+        'analytics.setUserProperty(): The supplied property must be a string value or null.'
+      );
+    }
     getNativeModule(this).setUserProperty(name, value);
   }
 
   /**
-   * Sets a user property to a given value.
+   * Sets multiple user properties to the supplied values.
    * @RNFirebaseSpecific
    * @param object
    */
   setUserProperties(object: Object): void {
     Object.keys(object).forEach(property => {
+      const value = object[property];
+      if (value !== null && !isString(value)) {
+        throw new Error(
+          `analytics.setUserProperties(): The property with name '${property}' must be a string value or null.`
+        );
+      }
       getNativeModule(this).setUserProperty(property, object[property]);
     });
   }