diff --git a/Assets/Cryville/Common/Pdt/PdtOperator.cs b/Assets/Cryville/Common/Pdt/PdtOperator.cs
index ac48982..7732ac5 100644
--- a/Assets/Cryville/Common/Pdt/PdtOperator.cs
+++ b/Assets/Cryville/Common/Pdt/PdtOperator.cs
@@ -47,7 +47,10 @@ namespace Cryville.Common.Pdt {
 		internal void Call(byte* prmem, bool noset) {
 			_prmem = prmem;
 			_rfreq = false;
-			try { Execute(); } catch (Exception) { _failure = true; }
+			try { Execute(); } catch (Exception ex) {
+				if (_rfreq) _etor.DiscardStack();
+				throw new InvalidOperationException("Evaluation failed", ex);
+			}
 			if (_failure) {
 				if (_rfreq) _etor.DiscardStack();
 				throw new InvalidOperationException("Evaluation failed");