diff --git a/src/Val.h b/src/Val.h
index db14ecadd0..4b958b360d 100644
--- a/src/Val.h
+++ b/src/Val.h
@@ -1218,7 +1218,7 @@ public:
 	bool HasField(const char *field) const
 		{
 		int idx = GetType()->AsRecordType()->FieldOffset(field);
-		return HasField(idx);
+		return (idx != -1) && HasField(idx);
 		}
 
 	/**