diff --git a/src/sdkClient/client.ts b/src/sdkClient/client.ts
index a572047e..5b0b7de2 100644
--- a/src/sdkClient/client.ts
+++ b/src/sdkClient/client.ts
@@ -123,6 +123,7 @@ export function clientFactory(params: IClientFactoryParams): SplitIO.IClient | S
     getTreatmentWithConfig,
     getTreatments,
     getTreatmentsWithConfig,
-    track
+    track,
+    isBrowserClient: false
   } as SplitIO.IClient | SplitIO.IAsyncClient;
 }
diff --git a/src/sdkClient/clientCS.ts b/src/sdkClient/clientCS.ts
index 8cf0d6a2..16648bc6 100644
--- a/src/sdkClient/clientCS.ts
+++ b/src/sdkClient/clientCS.ts
@@ -23,6 +23,8 @@ export function clientCSDecorator(log: ILogger, client: SplitIO.IClient, key: Sp
     getTreatmentsWithConfig: clientCS.getTreatmentsWithConfig.bind(clientCS, key),
 
     // Key is bound to the `track` method. Same thing happens with trafficType but only if provided
-    track: trafficType ? clientCS.track.bind(clientCS, key, trafficType) : clientCS.track.bind(clientCS, key)
+    track: trafficType ? clientCS.track.bind(clientCS, key, trafficType) : clientCS.track.bind(clientCS, key),
+
+    isBrowserClient: true
   }) as SplitIO.ICsClient;
 }
diff --git a/src/services/splitHttpClient.ts b/src/services/splitHttpClient.ts
index ee031149..d9ec90f7 100644
--- a/src/services/splitHttpClient.ts
+++ b/src/services/splitHttpClient.ts
@@ -49,7 +49,7 @@ export function splitHttpClientFactory(settings: Pick<ISettings, 'log' | 'versio
         return response;
       })
       .catch(error => {
-        const resp = error.response;
+        const resp = error && error.response;
         let msg = '';
 
         if (resp) { // An HTTP error
diff --git a/src/types.ts b/src/types.ts
index 9a94dd45..46451a60 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -381,6 +381,10 @@ interface IBasicClient extends IStatusInterface {
    * @returns {Promise<void>}
    */
   destroy(): Promise<void>
+
+  // Whether the client implements the client-side API, i.e, with bound key, (true), or the server-side API (false).
+  // Exposed for internal purposes only. Not considered part of the public API, and might be renamed eventually.
+  isBrowserClient: boolean
 }
 /**
  * Common definitions between SDK instances for different environments interface.
@@ -1139,7 +1143,7 @@ export namespace SplitIO {
     /**
      * Removes from client's in memory attributes storage the attribute with the given key
      * @function removeAttribute
-     * @param {string} attributeName 
+     * @param {string} attributeName
      * @returns {boolean} true if attribute was removed and false otherways
      */
     removeAttribute(attributeName: string): boolean,