diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/beaconchain/BeaconChainLowerBoundBlockDetector.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/beaconchain/BeaconChainLowerBoundBlockDetector.kt
index f8634566..0892bc71 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/beaconchain/BeaconChainLowerBoundBlockDetector.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/beaconchain/BeaconChainLowerBoundBlockDetector.kt
@@ -26,7 +26,8 @@ class BeaconChainLowerBoundBlockDetector(
     companion object {
         val notFoundError = "NOT_FOUND:" // e.g. {"message":"NOT_FOUND: beacon block at slot 1086646","code":404}
         val notFoundError2 = "Could not find requested block" // {"message":"Could not find requested block: signed beacon block can't be nil","code":404}
-        val stateErrors = setOf(notFoundError, notFoundError2)
+        val notFoundError3 = "has not been found" // Block header/data has not been found
+        val stateErrors = setOf(notFoundError, notFoundError2, notFoundError3)
     }
 
     override fun period(): Long {