diff --git a/front/src/Enum/EnvironmentVariable.ts b/front/src/Enum/EnvironmentVariable.ts
index c1f9efe4..6d84df3c 100644
--- a/front/src/Enum/EnvironmentVariable.ts
+++ b/front/src/Enum/EnvironmentVariable.ts
@@ -1,5 +1,5 @@
 const DEBUG_MODE: boolean = process.env.DEBUG_MODE == "true";
-const API_URL = window.location.protocol + '//' + process.env.API_URL || "http://api.workadventure.localhost";
+const API_URL = (window !== undefined ? window.location.protocol : 'http://') + '//' + (process.env.API_URL || "http://api.workadventure.localhost");
 const RESOLUTION = 3;
 const ZOOM_LEVEL = 1/*3/4*/;
 const POSITION_DELAY = 200; // Wait 200ms between sending position events