fix(compiler): avoid crash if 0th sample is the error

bitauth · Nov 12, 2019 · 06d86d8 · 06d86d8
1 parent cca15f2
commit 06d86d8
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/src/lib/auth/templates/language/reduce.ts b/src/lib/auth/templates/language/reduce.ts
@@ -216,9 +216,11 @@ export const evaluateInstructionAggregations = <
   const firstInvalidSample = samples.findIndex(
     sample => sample.state === undefined
   );
-  const errorSample = samples[firstInvalidSample - 1] as
-    | EvaluationSample<ProgramState>
-    | undefined;
+  const errorSample =
+    (samples[firstInvalidSample - 1] as
+      | EvaluationSample<ProgramState>
+      | undefined) ||
+    (samples[firstInvalidSample] as EvaluationSample<ProgramState> | undefined);
   return errorSample === undefined
     ? {
         samples: samples as Array<EvaluationSampleValid<ProgramState>>,