2 files changed, 11 insertions, 1 deletions

diff --git a/src/common/fiber.cpp b/src/common/fiber.cpp
index 62010d762..81b212e4b 100644
--- a/src/common/fiber.cpp
+++ b/src/common/fiber.cpp
@@ -124,7 +124,10 @@ void Fiber::YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to) {
 
     // "from" might no longer be valid if the thread was killed
     if (auto from = weak_from.lock()) {
-        ASSERT(from->impl->previous_fiber != nullptr);
+        if (from->impl->previous_fiber == nullptr) {
+            ASSERT_MSG(false, "previous_fiber is nullptr!");
+            return;
+        }
         from->impl->previous_fiber->impl->context = transfer.fctx;
         from->impl->previous_fiber->impl->guard.unlock();
         from->impl->previous_fiber.reset();
diff --git a/src/common/input.h b/src/common/input.h
index f775a4c01..f4f9eb30a 100644
--- a/src/common/input.h
+++ b/src/common/input.h
@@ -209,6 +209,13 @@ enum class ButtonNames {
     Triangle,
     Share,
     Options,
+
+    // Mouse buttons
+    ButtonMouseWheel,
+    ButtonBackward,
+    ButtonForward,
+    ButtonTask,
+    ButtonExtra,
 };
 
 // Callback data consisting of an input type and the equivalent data status