diff -Naurp pcp-3.12.2.orig/src/pmdas/perfevent/configparser.l pcp-3.12.2/src/pmdas/perfevent/configparser.l
--- pcp-3.12.2.orig/src/pmdas/perfevent/configparser.l	2017-09-06 06:00:26.000000000 +1000
+++ pcp-3.12.2/src/pmdas/perfevent/configparser.l	2018-01-30 08:05:25.603971547 +1100
@@ -289,6 +289,10 @@ static void set_pmcsetting_derived_scale
     if (context_derived)
     {
         setting_lists = config->derivedArr[config->nDerivedEntries-1].setting_lists;
+        if (NULL == setting_lists)
+        {
+            return;
+        }
         while (setting_lists->next)
         {
             setting_lists = setting_lists->next;
@@ -318,6 +322,10 @@ static void set_pmcsetting_cpuconfig(con
     if (context_derived)
     {
         setting_lists = config->derivedArr[config->nDerivedEntries-1].setting_lists;
+        if (NULL == setting_lists)
+        {
+            return;
+        }
         while (setting_lists->next)
         {
             setting_lists = setting_lists->next;