diff --git a/ProcessList.c b/ProcessList.c
index c234357..3bb1b81 100644
--- a/ProcessList.c
+++ b/ProcessList.c
@@ -473,7 +473,12 @@ static void ProcessList_readCGroupFile(Process* process, const char* dirname, co
       char** fields = String_split(trimmed, ':');
       free(trimmed);
 
-      process->cgroup = strndup(fields[2] + 1, 10);
+      if (!fields[1] || !fields[2]) {
+         process->cgroup = strdup(""); // cgroups do not work
+      }
+      else {
+         process->cgroup = strndup(fields[2] + 1, 10);
+      }
       String_freeArray(fields);
    }
    fclose(file);