From ad314bebdb67285e50ea71bf876b88ae7564c0f7 Mon Sep 17 00:00:00 2001
From: Nick Marks <nmarks@anl.gov>
Date: Sun, 8 Feb 2026 13:36:52 -0600
Subject: [PATCH] check if group struct pointer is null

---
 eigerApp/src/eigerDetector.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/eigerApp/src/eigerDetector.cpp b/eigerApp/src/eigerDetector.cpp
index c5d1bdd..e157edb 100644
--- a/eigerApp/src/eigerDetector.cpp
+++ b/eigerApp/src/eigerDetector.cpp
@@ -725,7 +725,14 @@ asynStatus eigerDetector::writeOctet (asynUser *pasynUser, const char *value,
         if(!strlen(value))
         {
             mFsGid = getgid();
-            mFileOwnerGroup->put(getgrgid(mFsGid)->gr_name);
+	    struct group* pgroup = getgrgid(mFsGid);
+
+	    if (pgroup) {
+		mFileOwnerGroup->put(pgroup->gr_name);
+	    } else {
+                ERR("couldn't find gid");
+                status = asynError;
+	    }
         }
         else
         {