diff --git a/src/compiler/blocks/compiler_natives.js b/src/compiler/blocks/compiler_natives.js
index cb674a98..f7ce0365 100644
--- a/src/compiler/blocks/compiler_natives.js
+++ b/src/compiler/blocks/compiler_natives.js
@@ -28,7 +28,7 @@ const number = /** @param {InputUtil} util */ (util) => {
     const NUM = util.fieldValueUnsafe('NUM');
     const number = Number(NUM);
     if (!Number.isNaN(number)) {
-        return util.number(number);
+        return util.number('' + number);
     }
     return util.fieldString('NUM');
 };
diff --git a/src/engine/thread.js b/src/engine/thread.js
index ba71cb4c..8c4379cc 100644
--- a/src/engine/thread.js
+++ b/src/engine/thread.js
@@ -428,7 +428,7 @@ class Thread {
     tryCompile(cache) {
         let result;
 
-        const topBlock = this.topBlock;
+        const topBlock = this.target.id + '|' + this.topBlock;
         if (cache.hasEntry(topBlock)) {
             if (cache.isCachedAsError(topBlock)) {
                 return;