diff --git a/src/newgrf_debug_gui.cpp b/src/newgrf_debug_gui.cpp
--- a/src/newgrf_debug_gui.cpp
+++ b/src/newgrf_debug_gui.cpp
@@ -702,8 +702,8 @@ void ShowNewGRFInspectWindow(GrfSpecFeat
 	if (!IsNewGRFInspectable(feature, index)) return;
 
 	WindowNumber wno = GetInspectWindowNumber(feature, index);
-	NewGRFInspectWindow *w = AllocateWindowDescFront<NewGRFInspectWindow>(feature == GSF_TRAINS || feature == GSF_ROADVEHICLES ? &_newgrf_inspect_chain_desc : &_newgrf_inspect_desc, wno);
-	if (w == NULL) w = (NewGRFInspectWindow *)FindWindowById(WC_NEWGRF_INSPECT, wno);
+	WindowDesc *desc = (feature == GSF_TRAINS || feature == GSF_ROADVEHICLES) ? &_newgrf_inspect_chain_desc : &_newgrf_inspect_desc;
+	NewGRFInspectWindow *w = AllocateWindowDescFront<NewGRFInspectWindow>(desc, wno, true);
 	w->SetCallerGRFID(grfid);
 }