diff --git a/node/impl/full/state.go b/node/impl/full/state.go
index 8097730f4..75e68f337 100644
--- a/node/impl/full/state.go
+++ b/node/impl/full/state.go
@@ -52,12 +52,14 @@ func (a *StateAPI) StateMinerPower(ctx context.Context, maddr address.Address, t
 		return api.MinerPower{}, err
 	}
 
-	slashed, err := stmgr.GetMinerSlashed(ctx, a.StateManager, ts, maddr)
-	if err != nil {
-		return api.MinerPower{}, err
-	}
-	if slashed != 0 {
-		mpow = types.NewInt(0)
+	if maddr != address.Undef {
+		slashed, err := stmgr.GetMinerSlashed(ctx, a.StateManager, ts, maddr)
+		if err != nil {
+			return api.MinerPower{}, err
+		}
+		if slashed != 0 {
+			mpow = types.NewInt(0)
+		}
 	}
 
 	return api.MinerPower{