diff --git a/osaca/semantics/marker_utils.py b/osaca/semantics/marker_utils.py
index 708f9f1..cfe0fb8 100755
--- a/osaca/semantics/marker_utils.py
+++ b/osaca/semantics/marker_utils.py
@@ -138,7 +138,7 @@ def find_marked_section(
                     index_start = i + 1
                 elif comments["end"] == line.comment:
                     index_end = i
-            elif line.instruction in mov_instr and lines[i + 1].directive is not None:
+            elif line.instruction in mov_instr and len(lines) > i + 1 and lines[i + 1].directive is not None:
                 source = line.operands[0 if not reverse else 1]
                 destination = line.operands[1 if not reverse else 0]
                 # instruction pair matches, check for operands