diff --git base/message_loop/message_pump_mac.mm base/message_loop/message_pump_mac.mm
index bb9e6d30bedd..e5ef7077c9de 100644
--- base/message_loop/message_pump_mac.mm
+++ base/message_loop/message_pump_mac.mm
@@ -785,7 +785,8 @@ void MessagePumpUIApplication::Detach() {
 #else
 
 ScopedPumpMessagesInPrivateModes::ScopedPumpMessagesInPrivateModes() {
-  DCHECK(g_app_pump);
+  if (!g_app_pump)
+    return;
   DCHECK_EQ(kNSApplicationModalSafeModeMask, g_app_pump->GetModeMask());
   // Pumping events in private runloop modes is known to interact badly with
   // app modal windows like NSAlert.
@@ -797,7 +798,8 @@ ScopedPumpMessagesInPrivateModes::ScopedPumpMessagesInPrivateModes() {
 }
 
 ScopedPumpMessagesInPrivateModes::~ScopedPumpMessagesInPrivateModes() {
-  DCHECK(g_app_pump);
+  if (!g_app_pump)
+    return;
   g_app_pump->SetModeMask(kNSApplicationModalSafeModeMask);
   g_app_pump->SetTimerInvalidationAllowed(true);
 }