diff --git a/extensions/git/src/git.ts b/extensions/git/src/git.ts
index 0ced42c7eac..9129f527fe6 100644
--- a/extensions/git/src/git.ts
+++ b/extensions/git/src/git.ts
@@ -155,6 +155,12 @@ export interface IExecutionResult {
 }
 
 async function exec(child: cp.ChildProcess, options: any = {}): Promise<IExecutionResult> {
+	if (!child.stdout || !child.stderr) {
+		throw new GitError({
+			message: 'Failed to get stdout or stderr from git process.'
+		});
+	}
+
 	const disposables: IDisposable[] = [];
 
 	const once = (ee: NodeJS.EventEmitter, name: string, fn: Function) => {