diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 65648a6b972..9ce04205fda 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -81,7 +81,7 @@ import { ExtHostTesting } from 'vs/workbench/api/common/extHostTesting';
 import { ExtHostUriOpeners } from 'vs/workbench/api/common/extHostUriOpener';
 import { IExtHostSecretState } from 'vs/workbench/api/common/extHostSecretState';
 import { IExtHostEditorTabs } from 'vs/workbench/api/common/extHostEditorTabs';
-import { IExtHostTelemetry, isNewAppInstall } from 'vs/workbench/api/common/extHostTelemetry';
+import { ExtHostTelemetryLogger, IExtHostTelemetry, isNewAppInstall } from 'vs/workbench/api/common/extHostTelemetry';
 import { ExtHostNotebookKernels } from 'vs/workbench/api/common/extHostNotebookKernels';
 import { TextSearchCompleteMessageType } from 'vs/workbench/services/search/common/searchExtTypes';
 import { ExtHostNotebookRenderers } from 'vs/workbench/api/common/extHostNotebookRenderers';
@@ -336,9 +336,10 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			get isNewAppInstall() {
 				return isNewAppInstall(initData.telemetryInfo.firstSessionDate);
 			},
-			createTelemetryLogger(appender: vscode.TelemetrySender): vscode.TelemetryLogger {
+			createTelemetryLogger(sender: vscode.TelemetrySender): vscode.TelemetryLogger {
 				checkProposedApiEnabled(extension, 'telemetryLogger');
-				return extHostTelemetry.instantiateLogger(extension, appender);
+				ExtHostTelemetryLogger.validateSender(sender);
+				return extHostTelemetry.instantiateLogger(extension, sender);
 			},
 			openExternal(uri: URI, options?: { allowContributedOpeners?: boolean | string }) {
 				return extHostWindow.openUri(uri, {
diff --git a/src/vs/workbench/api/common/extHostTelemetry.ts b/src/vs/workbench/api/common/extHostTelemetry.ts
index 2209e7ba2f5..d896eaff3e5 100644
--- a/src/vs/workbench/api/common/extHostTelemetry.ts
+++ b/src/vs/workbench/api/common/extHostTelemetry.ts
@@ -128,13 +128,31 @@ export class ExtHostTelemetry implements ExtHostTelemetryShape {
 }
 
 export class ExtHostTelemetryLogger {
-	private _appender: vscode.TelemetrySender;
+
+	static validateSender(sender: vscode.TelemetrySender): void {
+		if (typeof sender !== 'object') {
+			throw new TypeError('TelemetrySender argument is invalid');
+		}
+		if (typeof sender.sendEventData !== 'function') {
+			throw new TypeError('TelemetrySender.sendEventData must be a function');
+		}
+		if (typeof sender.sendErrorData !== 'function') {
+			throw new TypeError('TelemetrySender.sendErrorData must be a function');
+		}
+		if (typeof sender.flush !== 'undefined' && typeof sender.flush !== 'function') {
+			throw new TypeError('TelemetrySender.flush must be a function or undefined');
+		}
+	}
+
+	private readonly _sender: vscode.TelemetrySender;
 	private readonly _onDidChangeEnableStates = new Emitter<vscode.TelemetryLogger>();
-	private _telemetryEnablements: { isUsageEnabled: boolean; isErrorsEnabled: boolean };
-	private _apiObject: vscode.TelemetryLogger | undefined;
 	private readonly _ignoreBuiltinCommonProperties: boolean;
 	private readonly _additionalCommonProperties: Record<string, any> | undefined;
 	public readonly ignoreUnhandledExtHostErrors: boolean;
+
+	private _telemetryEnablements: { isUsageEnabled: boolean; isErrorsEnabled: boolean };
+	private _apiObject: vscode.TelemetryLogger | undefined;
+
 	constructor(
 		sender: vscode.TelemetrySender,
 		options: vscode.TelemetryLoggerOptions | undefined,
@@ -147,7 +165,7 @@ export class ExtHostTelemetryLogger {
 		this.ignoreUnhandledExtHostErrors = options?.ignoreUnhandledErrors ?? false;
 		this._ignoreBuiltinCommonProperties = options?.ignoreBuiltInCommonProperties ?? false;
 		this._additionalCommonProperties = options?.additionalCommonProperties;
-		this._appender = sender;
+		this._sender = sender;
 		this._telemetryEnablements = { isUsageEnabled: telemetryEnablements.isUsageEnabled, isErrorsEnabled: telemetryEnablements.isErrorsEnabled };
 	}
 
@@ -192,7 +210,7 @@ export class ExtHostTelemetryLogger {
 		}
 		data = this.mixInCommonPropsAndCleanData(data || {});
 		if (!this._inLoggingOnlyMode) {
-			this._appender.sendEventData(eventName, data);
+			this._sender.sendEventData(eventName, data);
 		}
 		this._logger.trace(eventName, data);
 	}
@@ -212,7 +230,7 @@ export class ExtHostTelemetryLogger {
 			this.logEvent(eventNameOrException, data);
 		} else {
 			// TODO @lramos15, implement cleaning for and logging for this case
-			this._appender.sendErrorData(eventNameOrException, data);
+			this._sender.sendErrorData(eventNameOrException, data);
 		}
 	}
 
@@ -237,8 +255,8 @@ export class ExtHostTelemetryLogger {
 	}
 
 	dispose(): void {
-		if (this._appender?.flush) {
-			this._appender.flush();
+		if (this._sender?.flush) {
+			this._sender.flush();
 		}
 	}
 }
diff --git a/src/vs/workbench/api/test/browser/extHostTelemetry.test.ts b/src/vs/workbench/api/test/browser/extHostTelemetry.test.ts
index c52a59303d2..aa477a17049 100644
--- a/src/vs/workbench/api/test/browser/extHostTelemetry.test.ts
+++ b/src/vs/workbench/api/test/browser/extHostTelemetry.test.ts
@@ -10,7 +10,7 @@ import { DEFAULT_LOG_LEVEL, LogLevel } from 'vs/platform/log/common/log';
 import { ITelemetryInfo, TelemetryLevel } from 'vs/platform/telemetry/common/telemetry';
 import { TestTelemetryLoggerService } from 'vs/platform/telemetry/test/common/telemetryLogAppender.test';
 import { IExtHostInitDataService } from 'vs/workbench/api/common/extHostInitDataService';
-import { ExtHostTelemetry } from 'vs/workbench/api/common/extHostTelemetry';
+import { ExtHostTelemetry, ExtHostTelemetryLogger } from 'vs/workbench/api/common/extHostTelemetry';
 import { IEnvironment } from 'vs/workbench/services/extensions/common/extensionHostProtocol';
 import { mock } from 'vs/workbench/test/common/workbenchTestServices';
 import type { TelemetrySender } from 'vscode';
@@ -91,6 +91,31 @@ suite('ExtHostTelemetry', function () {
 		return logger;
 	};
 
+	test('Validate sender instances', function () {
+		assert.throws(() => ExtHostTelemetryLogger.validateSender(<any>null));
+		assert.throws(() => ExtHostTelemetryLogger.validateSender(<any>1));
+		assert.throws(() => ExtHostTelemetryLogger.validateSender(<any>{}));
+		assert.throws(() => {
+			ExtHostTelemetryLogger.validateSender(<any>{
+				sendErrorData: () => { },
+				sendEventData: true
+			});
+		});
+		assert.throws(() => {
+			ExtHostTelemetryLogger.validateSender(<any>{
+				sendErrorData: 123,
+				sendEventData: () => { },
+			});
+		});
+		assert.throws(() => {
+			ExtHostTelemetryLogger.validateSender(<any>{
+				sendErrorData: () => { },
+				sendEventData: () => { },
+				flush: true
+			});
+		});
+	});
+
 	test('Ensure logger gets proper telemetry level during initialization', function () {
 		const extensionTelemetry = createExtHostTelemetry();
 		let config = extensionTelemetry.getTelemetryDetails();