(svn r19388) -Fix [FS#3666]: [NoAI] When reloading a savegame, an AI failing to compile could trigger (trying) to read the not yet loaded information of another AI via the AI Debug window and its "open with the most recently used AI" feature

src/ai/ai_gui.cpp

@@ -1016,3 +1016,11 @@ void ShowAIDebugWindow(CompanyID show_company)
 		ShowErrorMessage(STR_ERROR_AI_DEBUG_SERVER_ONLY, INVALID_STRING_ID, WL_INFO);
 	}
 }
+
+/**
+ * Reset the AI windows to their initial state.
+ */
+void InitializeAIGui()
+{
+	AIDebugWindow::ai_debug_company = INVALID_COMPANY;
+}