--- a/src/searching.c
+++ b/src/searching.c
@@ -641,6 +641,11 @@
   length = 0;
   for(i=0; i<parts; i++) {
     uint32_t cellnr, endcellnr;
+    /* This mimics pgcn checks in ifoRead_VTS_PTT_SRPT() */
+    if (ptt[i].pgcn > 1000 || ptt[i].pgcn < 0) {
+      printerr("PGCN out of bounds.");
+      continue;
+    }
     if (ifo->vts_pgcit->pgci_srp[ptt[i].pgcn-1].pgc_start_byte >= ifo->vts_pgcit->last_byte) {
       printerr("PGC start out of bounds");
       continue;