diff --git a/projects/rocprofiler/bin/tblextr.py b/projects/rocprofiler/bin/tblextr.py
index 6d05a644bf..9d47b5c4f3 100755
--- a/projects/rocprofiler/bin/tblextr.py
+++ b/projects/rocprofiler/bin/tblextr.py
@@ -237,7 +237,9 @@ def fill_ext_db(table_name, db, indir, trace_name, api_pid):
           continue
 
         if cid == 2:
+          if not pid in range_stack: fatal("ROCTX range begin missed, pid(" + pid + ")");
           pid_stack = range_stack[pid]
+          if not tid in pid_stack: fatal("ROCTX range begin missed, tid(" + tid + ")");
           rec_stack = pid_stack[tid]
           rec_vals = rec_stack.pop()
           rec_vals[1] = tms