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-rw-r--r--industry_gui.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/industry_gui.c b/industry_gui.c
index 5d55ecf67..6c45678b3 100644
--- a/industry_gui.c
+++ b/industry_gui.c
@@ -345,7 +345,7 @@ static void IndustryViewWndProc(Window *w, WindowEvent *e)
x = e->click.pt.x;
line = (e->click.pt.y - 127) / 10;
- if (e->click.pt.y >= 127 && IS_INT_INSIDE(line, 0, 2) && i->produced_cargo[line]) {
+ if (e->click.pt.y >= 127 && IS_INT_INSIDE(line, 0, 2) && i->produced_cargo[line] != CT_INVALID) {
if (IS_INT_INSIDE(x, 5, 25) ) {
// clicked buttons
if (x < 15) {