diff --git a/Assets/Cryville/Common/Pdt/PdtVariableMemory.cs b/Assets/Cryville/Common/Pdt/PdtVariableMemory.cs
index 936d0da..8f3db02 100644
--- a/Assets/Cryville/Common/Pdt/PdtVariableMemory.cs
+++ b/Assets/Cryville/Common/Pdt/PdtVariableMemory.cs
@@ -20,6 +20,13 @@ namespace Cryville.Common.Pdt {
 			Length = len;
 		}
 		/// <summary>
+		/// Copies the memory in the span to another span.
+		/// </summary>
+		/// <param name="dest">The destination span.</param>
+		public void CopyTo(PdtVariableMemory dest) {
+			CopyTo(dest._ptr, 0, Length);
+		}
+		/// <summary>
 		/// Copies the memory in the span to a buffer.
 		/// </summary>
 		/// <param name="dest">The destination buffer.</param>
diff --git a/Assets/Cryville/Crtr/PdtEvaluator.cs b/Assets/Cryville/Crtr/PdtEvaluator.cs
index 5516830..d0695ec 100644
--- a/Assets/Cryville/Crtr/PdtEvaluator.cs
+++ b/Assets/Cryville/Crtr/PdtEvaluator.cs
@@ -388,12 +388,16 @@ namespace Cryville.Crtr {
 			public func_in_area() : base(1) { }
 			protected override unsafe void Execute() {
 				var arg = GetOperand(0);
-				if (arg.Type == PdtInternalType.Number && arg.AsNumber() >= 0) {
-					GetReturnFrame(PdtInternalType.Null, 0);
-					return;
+				if (arg.Type == PdtInternalType.Error) {
+					throw new InvalidOperationException("Error");
+				}
+				else if (arg.Type == PdtInternalType.Number && arg.AsNumber() >= 0) {
+					GetReturnFrame(PdtInternalType.Null, 0);
+				}
+				else {
+					var ret = GetReturnFrame(arg.Type, arg.Length);
+					arg.CopyTo(ret);
 				}
-				var ret = GetReturnFrame(arg.Type, arg.Length);
-				arg.CopyTo(ret);
 			}
 		}
 		unsafe static class oputil {