1 files changed, 4 insertions, 1 deletions
diff --git a/lib/wallet/chromeBadge.ts b/lib/wallet/chromeBadge.ts
index 6586f7e6e..df12fba83 100644
--- a/lib/wallet/chromeBadge.ts
+++ b/lib/wallet/chromeBadge.ts
@@ -86,6 +86,9 @@ export class ChromeBadge implements Badge {
   constructor(window?: Window) {
     // Allow injecting another window for testing
     let bg = window || chrome.extension.getBackgroundPage();
+    if (!bg) {
+      throw Error("no window available");
+    }
     this.canvas = bg.document.createElement("canvas");
     // Note: changing the width here means changing the font
     // size in draw() as well!
@@ -221,4 +224,4 @@ export class ChromeBadge implements Badge {
   stopBusy() {
     this.isBusy = false;
   }
-}
-\ No newline at end of file
+}