diff --git a/src/osd/osd_primary.cpp b/src/osd/osd_primary.cpp
index 911a9325..761e965a 100644
--- a/src/osd/osd_primary.cpp
+++ b/src/osd/osd_primary.cpp
@@ -35,7 +35,15 @@ bool osd_t::prepare_primary_rw(osd_op_t *cur_op)
         // oid.stripe = starting offset of the parity stripe
         .stripe = (cur_op->req.rw.offset/pg_block_size)*pg_block_size,
     };
-    pg_num_t pg_num = (oid.stripe/pool_cfg.pg_stripe_size) % pg_counts[pool_id] + 1; // like map_to_pg()
+    // FIXME: pg_counts should be stored in pool_config, not in a separate map
+    auto pg_count = pg_counts[pool_id];
+    if (!pg_count)
+    {
+        // Pool config is not loaded yet
+        finish_op(cur_op, -EPIPE);
+        return false;
+    }
+    pg_num_t pg_num = (oid.stripe/pool_cfg.pg_stripe_size) % pg_count + 1; // like map_to_pg()
     auto pg_it = pgs.find({ .pool_id = pool_id, .pg_num = pg_num });
     if (pg_it == pgs.end() || pg_it->second.state == PG_OFFLINE)
     {