diff --git a/eth/tracers/live/filter_api.go b/eth/tracers/live/filter_api.go
index d6e74a2a89..a0bc57b38c 100644
--- a/eth/tracers/live/filter_api.go
+++ b/eth/tracers/live/filter_api.go
@@ -2,6 +2,7 @@ package live
 
 import (
 	"context"
+	"errors"
 
 	"github.com/ethereum/go-ethereum/eth/tracers"
 	"github.com/ethereum/go-ethereum/rpc"
@@ -20,16 +21,25 @@ var defaultTraceConfig = &traceConfig{
 	Tracer: "callTracer",
 }
 
-func (api *filterAPI) Block(ctx context.Context, blockNr rpc.BlockNumber, cfg *traceConfig) ([]*traceResult, error) {
-	blknum := uint64(blockNr.Int64())
-	if blockNr == rpc.LatestBlockNumber {
-		blknum = api.filter.latest.Load()
-	}
+func (api *filterAPI) isSupportedTracer(tracer string) bool {
+	_, ok := api.filter.tracer.Tracers()[tracer]
+	return ok
+}
 
+func (api *filterAPI) Block(ctx context.Context, blockNr rpc.BlockNumber, cfg *traceConfig) ([]*traceResult, error) {
 	tracer := defaultTraceConfig.Tracer
 	if cfg != nil {
 		tracer = cfg.Tracer
 	}
 
+	if !api.isSupportedTracer(tracer) {
+		return nil, errors.New("tracer not found")
+	}
+
+	blknum := uint64(blockNr.Int64())
+	if blockNr == rpc.LatestBlockNumber {
+		blknum = api.filter.latest.Load()
+	}
+
 	return api.filter.readBlockTraces(ctx, tracer, blknum)
 }