diff --git a/lib/electrumx_rpc/electrumx.dart b/lib/electrumx_rpc/electrumx.dart
index 6667c3de5..8803f12fa 100644
--- a/lib/electrumx_rpc/electrumx.dart
+++ b/lib/electrumx_rpc/electrumx.dart
@@ -310,6 +310,13 @@ class ElectrumX {
         requestID: requestID,
         command: 'blockchain.headers.subscribe',
       );
+      if (response["result"] == null) {
+        Logging.instance.log(
+          "getBlockHeadTip returned null response",
+          level: LogLevel.Error,
+        );
+        throw 'getBlockHeadTip returned null response';
+      }
       return Map<String, dynamic>.from(response["result"] as Map);
     } catch (e) {
       rethrow;