diff --git a/Signal/src/util/MainAppContext.m b/Signal/src/util/MainAppContext.m
index 9790ae493..e367efa31 100644
--- a/Signal/src/util/MainAppContext.m
+++ b/Signal/src/util/MainAppContext.m
@@ -157,6 +157,7 @@ NSString *const ReportedApplicationStateDidChangeNotification = @"ReportedApplic
 
 - (BOOL)isMainAppAndActive
 {
+    if (![NSThread isMainThread]) { return NO; }
     return [UIApplication sharedApplication].applicationState == UIApplicationStateActive;
 }