From 26245e2fbfc522cd4853dab65ecdc57453092199 Mon Sep 17 00:00:00 2001
From: Bertho Stultiens <bertho@vagrearg.org>
Date: Fri, 6 Feb 2026 17:35:05 +0100
Subject: [PATCH] milltask: Don't crash when no tool data file specified.

---
 src/emc/tooldata/tooldata_common.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/emc/tooldata/tooldata_common.cc b/src/emc/tooldata/tooldata_common.cc
index a6fea970be0..df56b01c73e 100644
--- a/src/emc/tooldata/tooldata_common.cc
+++ b/src/emc/tooldata/tooldata_common.cc
@@ -388,6 +388,13 @@ int tooldata_save(const char *filename)
         if (!is_random_toolchanger) {return 0;}
         filename = DB_SPINDLE_SAVE; //one entry tbl (nonran only)
     } else {
+        // filename == NULL happens without ini entry [EMCIO]TOOL_TABLE
+        // and a Task::emcToolSetOffset is performed.
+        if (!filename) {
+            fprintf(stderr, "%s: No filename. Are you missing INI-entry [EMCIO]TOOL_TABLE?\n",
+                    __PRETTY_FUNCTION__);
+            return -1;
+        }
         if (filename[0] == 0) {
             UNEXPECTED_MSG;
         }