From bd92778bf7b97b6a1ca463387c1dee062b4360a3 Mon Sep 17 00:00:00 2001
From: Joe Polny <joepolny@gmail.com>
Date: Wed, 23 Oct 2024 08:33:32 -0400
Subject: [PATCH] fix: improve internal error message for pc mapping

---
 src/lib/compiler.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/lib/compiler.ts b/src/lib/compiler.ts
index eea3c5389..3caa964ce 100644
--- a/src/lib/compiler.ts
+++ b/src/lib/compiler.ts
@@ -7613,6 +7613,16 @@ declare type AssetFreezeTxn = Required<AssetFreezeParams>;
     this.sourceInfo.forEach((sm) => {
       if (this.hasDynamicTemplateVar) {
         if (sm.teal - 1 <= lastCblockLine) return;
+        const pcs = this.lineToPc[sm.teal - 1];
+
+        if (pcs === undefined) {
+          throw new Error(
+            `Internal Compiler Error: PC values not found when trying to calculate cblock offsets for TEAL line ${
+              sm.teal
+            } (${this.teal[program][sm.teal - 1].teal}). Last cblock line was ${lastCblockLine}.`
+          );
+        }
+
         // eslint-disable-next-line no-param-reassign
         sm.pc = this.lineToPc[sm.teal - 1].map((pc) => pc - lastCblockPc);
         return;