From cdec5a1cef08e463e7c953d0521735a7a06ac541 Mon Sep 17 00:00:00 2001
From: picklesrus <picklesrus@users.noreply.github.com>
Date: Tue, 8 Jan 2019 15:00:00 -0500
Subject: [PATCH] Allow projects with unknown monitors to load.

---
 src/serialization/sb2.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/serialization/sb2.js b/src/serialization/sb2.js
index 7b6defd1d..5e28e8276 100644
--- a/src/serialization/sb2.js
+++ b/src/serialization/sb2.js
@@ -256,6 +256,13 @@ const globalBroadcastMsgStateGenerator = (function () {
  */
 
 const parseMonitorObject = (object, runtime, targets, extensions) => {
+    // If we can't find the block in the spec map, ignore it.
+    // This happens for things like Lego Wedo 1.0 monitors.
+    const mapped = specMap[object.cmd];
+    if (!mapped) {
+        log.warn(`Could not find monitor block with opcode: ${object.cmd}`);
+        return;
+    }
     // In scratch 2.0, there are two monitors that now correspond to extension
     // blocks (tempo and video motion/direction). In the case of the
     // video motion/direction block, this reporter is not monitorable in Scratch 3.0.