diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index 1e97f35..b8b3f51 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -127,6 +127,11 @@
     std::scoped_lock lock(mDisplayLock);
     mRefreshRateSelectors.erase(displayId);
 
+    // Do not allow removing the final display. Code in the scheduler expects
+    // there to be at least one display. (This may be relaxed in the future with
+    // headless virtual display.)
+    LOG_ALWAYS_FATAL_IF(mRefreshRateSelectors.empty(), "Cannot unregister all displays!");
+
     promoteLeaderDisplay();
 }