diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index e91ba3909..09fcf0154 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -291,6 +291,7 @@ void ImDrawList::ChannelsMerge()
 
 void ImDrawList::ChannelsSetCurrent(int idx)
 {
+    IM_ASSERT(idx < _ChannelsCount);
     if (_ChannelsCurrent == idx) return;
     memcpy(&_Channels.Data[_ChannelsCurrent].CmdBuffer, &CmdBuffer, sizeof(CmdBuffer)); // copy 12 bytes, four times
     memcpy(&_Channels.Data[_ChannelsCurrent].IdxBuffer, &IdxBuffer, sizeof(IdxBuffer));