diff --git a/src/vs/workbench/electron-browser/shell.ts b/src/vs/workbench/electron-browser/shell.ts
index c5eb4b88f2032873beb688a42bec585391ee70bc..0430727fa3e54965e730a367cfbc9f12839c0051 100644
--- a/src/vs/workbench/electron-browser/shell.ts
+++ b/src/vs/workbench/electron-browser/shell.ts
@@ -225,9 +225,9 @@ export class WorkbenchShell {
 			userAgent: navigator.userAgent,
 			windowSize: { innerHeight: window.innerHeight, innerWidth: window.innerWidth, outerHeight: window.outerHeight, outerWidth: window.outerWidth },
 			emptyWorkbench: this.contextService.getWorkbenchState() === WorkbenchState.EMPTY,
-			'workbench.filesToOpen': filesToOpen && filesToOpen.length || void 0,
-			'workbench.filesToCreate': filesToCreate && filesToCreate.length || void 0,
-			'workbench.filesToDiff': filesToDiff && filesToDiff.length || void 0,
+			'workbench.filesToOpen': filesToOpen && filesToOpen.length || 0,
+			'workbench.filesToCreate': filesToCreate && filesToCreate.length || 0,
+			'workbench.filesToDiff': filesToDiff && filesToDiff.length || 0,
 			customKeybindingsCount: info.customKeybindingsCount,
 			theme: this.themeService.getColorTheme().id,
 			language: platform.language,
diff --git a/src/vs/workbench/services/telemetry/common/workspaceStats.ts b/src/vs/workbench/services/telemetry/common/workspaceStats.ts
index 5bdecfc2d372dd1d8aac8e4ee6ca99e2ee0889ee..9275928cd440e288a04cec998403c7b0ea382115 100644
--- a/src/vs/workbench/services/telemetry/common/workspaceStats.ts
+++ b/src/vs/workbench/services/telemetry/common/workspaceStats.ts
@@ -176,9 +176,9 @@ export class WorkspaceStats {
 		const tags: Tags = Object.create(null);
 
 		const { filesToOpen, filesToCreate, filesToDiff } = configuration;
-		tags['workbench.filesToOpen'] = filesToOpen && filesToOpen.length || undefined;
-		tags['workbench.filesToCreate'] = filesToCreate && filesToCreate.length || undefined;
-		tags['workbench.filesToDiff'] = filesToDiff && filesToDiff.length || undefined;
+		tags['workbench.filesToOpen'] = filesToOpen && filesToOpen.length || 0;
+		tags['workbench.filesToCreate'] = filesToCreate && filesToCreate.length || 0;
+		tags['workbench.filesToDiff'] = filesToDiff && filesToDiff.length || 0;
 
 		const isEmpty = this.contextService.getWorkbenchState() === WorkbenchState.EMPTY;
 		const workspace = this.contextService.getWorkspace();