--- a/client/src/lib/session.js	Thu Jul 05 18:01:39 2018 +0200
+++ b/client/src/lib/session.js	Thu Jul 05 18:15:04 2018 +0200
@@ -1,7 +1,10 @@
 function sessionStillActive(expiresFromPastSession) {
   if (!expiresFromPastSession) return false;
   const now = Date.now();
-  const sessionEnd = expiresFromPastSession;
+  const sessionEnd =
+    typeof expiresFromPastSession === "string"
+      ? expiresFromPastSession * 1000
+      : expiresFromPastSession;
   const stillActive = now < sessionEnd;
   return stillActive;
 }

--- a/client/tests/unit/session.spec.js	Thu Jul 05 18:01:39 2018 +0200
+++ b/client/tests/unit/session.spec.js	Thu Jul 05 18:15:04 2018 +0200
@@ -13,3 +13,13 @@
   const active = Date.now() + 60000;
   expect(sessionStillActive(active)).toBe(true);
 });
+
+test("Session alive with string", () => {
+  const active = "" + Date.now() + 60000;
+  expect(sessionStillActive(active)).toBe(true);
+});
+
+test("Session expired with string", () => {
+  const expired = "" + Date.now() - 60000;
+  expect(sessionStillActive(expired)).toBe(false);
+});