Fix arith error

sigp · Sep 28, 2020 · df3bba1 · df3bba1
1 parent 178d7d3
commit df3bba1
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/consensus/types/src/shuffling_id.rs b/consensus/types/src/shuffling_id.rs
@@ -35,7 +35,10 @@ impl ShufflingId {
     ) -> Result<Self, BeaconStateError> {
         let shuffling_epoch = relative_epoch.into_epoch(state.current_epoch());
 
-        let shuffling_decision_slot = (shuffling_epoch - 1).start_slot(E::slots_per_epoch()) - 1;
+        let shuffling_decision_slot = shuffling_epoch
+            .saturating_sub(1_u64)
+            .start_slot(E::slots_per_epoch())
+            .saturating_sub(1_u64);
 
         let shuffling_decision_block = if state.slot == shuffling_decision_slot {
             block_root