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-rw-r--r--src/widget.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/widget.cpp b/src/widget.cpp
index fc6b88101..c3f9eca29 100644
--- a/src/widget.cpp
+++ b/src/widget.cpp
@@ -175,6 +175,8 @@ int GetWidgetFromPos(const Window *w, int x, int y)
*/
void DrawFrameRect(int left, int top, int right, int bottom, Colours colour, FrameFlags flags)
{
+ assert(colour < COLOUR_END);
+
uint dark = _colour_gradient[colour][3];
uint medium_dark = _colour_gradient[colour][5];
uint medium_light = _colour_gradient[colour][6];