diff --git a/lib/compiler.js b/lib/compiler.js
index eeb1515c..0dd35c11 100644
--- a/lib/compiler.js
+++ b/lib/compiler.js
@@ -173,7 +173,9 @@ function logSnapshotWarningMessage($logger) {
 
 function stopWebpackForPlatform(platform) {
     const webpackProcess = webpackProcesses[platform];
-    webpackProcess.kill("SIGINT");
-    delete webpackProcesses[platform];
+    if (webpackProcess) {
+        webpackProcess.kill("SIGINT");
+        delete webpackProcesses[platform];
+    }
 }