diff --git a/src/mobile-config-autoconfig.js b/src/mobile-config-autoconfig.js
index 6f1f4e3..68a6bb7 100644
--- a/src/mobile-config-autoconfig.js
+++ b/src/mobile-config-autoconfig.js
@@ -71,7 +71,12 @@ function log_obj(obj) {
 }
 
 function get_firefox_version() {
-    return Services.appinfo.lastAppVersion.split(".")[0];
+    try {
+        return Services.appinfo.lastAppVersion.split(".")[0];
+    } catch(e) {
+        log("Couldn't get Firefox version (expected on first start): " + e);
+        return 0;
+    }
 }
 
 function get_firefox_version_previous() {