diff --git a/imgui.cpp b/imgui.cpp
index e8154e8..2d05103 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -2495,6 +2495,7 @@
     if (window->SkipItems)
         return;
 
+	IM_ASSERT(text != NULL);
     const char* text_begin = text;
     if (text_end == NULL)
         text_end = text + strlen(text);